A/N: It's been a long, long time since the last update to this story. Sorry about that. For those that like it, I will continue this for a while.

Beta thanks go to MarkeyDeSad, once again.

Fourth mission in this story is based on "Chuck Versus the Mask" but is different due to Chuck and Sarah's relationship.

Warning: As with the previous chapters, this has more adult content than my longer stories, but is still just about T-rated.


Missions
Mission 4


Chuck was having a fairly lazy day in the Buy More. Casey was out on a mission, not needing Chuck or Sarah. Lester was actually on vacation. Morgan had questioned him before he left. Lester didn't want to talk about it, but finally confessed he was visiting his family in Canada. Without Lester goading him, Jeff was subdued, so wasn't causing any trouble. Customer traffic was quite light and no one seemed to have any problems that needed the Nerd Herd to fix.

Basically, Chuck had his feet up on the second chair behind the desk and was just daydreaming. That dream was the usual one. Not a dream, really, more a memory. He was thinking of the night before and the sex with the most gorgeous woman on the planet.

They'd gone to bed early because Ellie and Devon were away on vacation for the whole week. Chuck wasn't sure his body would cope with a week of wild sex like last night's. Considering Sarah had abstained for two and a half years, it was almost as if she was trying to make up for lost time some nights, and last night was certainly one of those.

He wasn't complaining, but nor was he sure about his endurance. Thankfully, she enjoyed him using his fingers and tongue almost as much, so that took the edge off for her. He loved that too, so both were happy.

He was thinking about just that, when his phone rang. He looked at who was calling. The woman of his dreams. He quickly answered it. "Hello, gorgeous. Just thinking about you."

"Oh, and what about me?" Sarah couldn't help asking.

He spoke a bit quieter. "Oh, being between your legs and enjoying my favorite taste."

Sarah suddenly thought about that too and how good it had been last night. She had to shake her head to get back into work mode. "You can taste those delights again tonight, Chuck, but right now we have an emergency."

Chuck shifted into work mode. Mission work mode. "What?"

"Casey's mission has gone sideways. We need to go and rescue him."

"I thought he was sure he needed no help," Chuck replied.

"Well, it seems he was wrong," she replied. "I'm calling it in for a Nerd Herd site visit."

As she was speaking the request came through.

Chuck rushed to tell Big Mike, but the manager was more worried about the lack of sales and the fact that he only had one donut left.

Chuck rushed out the door and leaped into the Nerd herder.

Sarah's Porsche was in front of him and her call came through.

"So, what's wrong?" Chuck asked.

"He was lowering himself into the museum's vault to grab the mask that will be on show there tonight. He must have triggered the security and he's trapped in there. All the air is being sucked out."

"So, how can I help?" he asked.

"I intercepted the call from the curator reporting the problem and said I'd get an expert in IT systems to help with what he thought was a computer glitch." She paused. "You'll need to reboot the museum's server, which will reset the security system, causing the vault door to open."

"I doubt they'll let me access the server," he responded.

She paused. "I'll sweet talk the curator. You'll get access."

"I hope we can do this, Sarah," he replied.

"Me too, but I have faith in both of us, Chuck."


Once Chuck reached the museum, he jumped out of his car, put his bag over his shoulder and almost ran in. Sarah came with him.

They ran through to the door marked "Control Room."

As Chuck entered the room, the man in there turned to him. "Oh, you're here. Thank heavens someone called you."

Chuck looked at him . "Yeah, uh, what seems to be the problem?"

"I'm the curator of Classical Art. I've never even touched one of these machines in my life. All I know is the museum went into full lockdown mode. It's designed to protect the collections from fire, but unless you fix it, there's no way to control the temperature or the humidity. Some of these pieces are extremely sensitive."

Sarah saw that she didn't need to do anything to help Chuck get access, so she slipped out and headed to the location from which Casey would have dropped into the vault. When she got there, she told Chuck, "I'm in the crawl space above the vault." She looked at the hatch. "There's no way of manually opening that hatch, Chuck, without using C4, but Casey will be too close and it'd kill him." She paused, then said, "It's up to you, Chuck. Sorry."

The curator continued to ramble. "Some of these artifacts are over 3, 000 years old. To have survived that long and then to be ruined by some stupid computer system."

Chuck could hardly think with both Sarah's comments in one ear and this man in the other. "Sorry, I need to concentrate."

The curator stopped and said, "Okay, but please do something."

Chuck got his head down and started the process of restarting the server."

His fingers were a blur as they worked the keyboard.

Sarah looked at her watch and had to speak, even if Chuck didn't want to hear what she had to say. "He's nearly out of time. I think I'm going to have to blow the hatch anyway."

"No…" Chuck shouted. "Don't!" He then saw the curator's startled face. He looked at the man and shrugged. "Sometimes talking to the computer helps."

After a few seconds, he hit the key that triggered the reboot.

The hatch in front of Sarah opened. Casey was still conscious so she was able to help him out. "You did it, Chuck," she said, feeling so proud of him.

"Splendid work, absolutely top notch," the curator said. "Really, I mean, I can't thank you enough."

The man was obviously from England. Chuck smiled at both his accent and his words, then he replied, "Any time."

The man looked even happier. "Oh, all right. Um, how about tomorrow night?"

Chuck stared at the man. "What?"

"Well, it's the unveiling of the Mask of Alexander. Everyone in the art world's going to be there, and I'd like you to be also."

Chuck was flattered, but replied, "Not that I don't appreciate the invitation..."

The man cut him off. "Oh, no, no. I'm not inviting you. I'm hiring you. I want you there to ensure that, well, there's no more, uh, what do you call them? Bugs."

Casey's voice came through, "Take the job, Chuck. You're going to give me another try."

Sarah didn't like the sound of that, but would join Chuck in his vigil. "I'll be with you, Chuck."

Chuck accepted. He'd rather be home with her, but they'd at least have privacy here.


Casey was adamant that he was capable of repeating the task, but this time, he wouldn't slip. Sarah wasn't convinced, so was fully ready to go up there and do it, if necessary. However, she much preferred what she and Chuck were doing in the control room.

It was all Sarah's idea. Chuck would have just focused on doing the job, but this visit was replacing the time in bed that she'd expected. She had no intention of missing sex this evening.

Sarah had told him that sex in this room was going to be exciting. It wasn't the room per se. There was something exciting about sex in a place they shouldn't. The fact that at any moment, that curator might return and find them added an extra thrill.

She had planned this and deliberately worn a short skirt that was easy to push up out of the way.

The chair Chuck was going to use if he needed to access the computer terminal had a hydraulic seat. Nice and springy. The arms of the chair meant Sarah would have to sit on him facing away, once she'd removed her panties, with her skirt bunched up around her waist, almost like a belt.

Everything would have been easier if the chair didn't have arms like it had. Then, she'd have straddled him, unbuttoned her blouse and pushed her breasts into his face. As it was, they'd have to do things differently, and her breasts were not going to get the attention they deserved, sadly.

Sarah pulled Chuck's pants and boxers down to his ankles, but left his Buy More shirt and tie on. He was ready so she carefully lowered herself onto him while holding the arms of the chair.

After that, it was all up to her. He couldn't move in that position. Well, maybe not just her. Thanks to the hydraulics, the additional bounce added to the pleasure they received from her actions.

They had their mics turned off, so they wouldn't be distracting Casey, although they did have the earpieces working, so they could hear if he needed help.

Luckily for Sarah, she finished before one of the sensors they'd set up triggered an alarm.

They obviously couldn't continue, so Sarah reluctantly climbed off Chuck, much to his disappointment.

Chuck quickly wheeled the chair across to the terminal and the two of them looked at the monitor which showed two men passing through the door to the stairs leading up to where Casey currently was.

When Chuck looked at the people gathered in the main room waiting to see the mask, he spotted someone lurking at the back. He saw the man's face and flashed. He gasped and told Sarah, "Their leader is Nikos Vasillis. He's the Ring agent who broke into the museum in Damascus that started this mission off. He's the one wanting the mask."

"I've got to help Casey," she declared.

Then, they heard Casey. "They've found me."

Sarah looked at the camera view trained on where Casey was working. Sure enough, the two men were fighting with Casey. She picked up her panties, quickly pulled them up, pushed down and smoothed her skirt, and then grabbed her gun, ready to run out.

"No, take this," Chuck said, jumping up and thrusting his tranquillizer gun into her hand after grabbing it from his bag.

She had difficulty taking her eyes off of him, standing there with his pants and boxers still around his ankles; how he was able to stay upright like that was a mystery. She already knew he'd not reached the point she had, but it was very obvious as he stood in front of her. She was determined to address that later.

Snapping back into agent mode, she took the gun from him and ran out..

Chuck pulled his clothes up and sat back down at the terminal. He needed to make sure no one else followed Sarah.

As she ran up the stairs, she hoped the darts would be quick acting.

When she neared the top of the stairs, she heard the men talking. "He was going to drop down and lift it, hoping not to set off the security system."

"I heard it was playing up earlier. I wouldn't want to risk it."

That was the last either of them said, as both received darts in their necks. Sarah saw that the tranquillizer was indeed fast acting as both men immediately slumped to the ground.

Sarah rushed to Casey. He was alive, but had obviously been knocked unconscious. She looked down into the vault, Casey had the ropes dangling down, but just hadn't gotten to use them.

She quickly secured herself to the ropes and lowered herself down, taking the false mask with her.

Swapping them was easy, but getting back up was going to be hard without using the winch which she'd not thought of. "Chuck, I need some help."

"On my way," he replied.

He quickly got up there. He stopped for a second, seeing the men on the floor, but then saw the darts protruding from their necks. He smiled and muttered to himself, "Good girl."

It didn't take him long to hoist Sarah back up, which was lucky as the security system kicked in just as she handed the mask to him.

"Shit! I must have set it off somehow," she said.

Sarah looked at the three bodies. She had to leave them and get the mask out first. On the way out, she quickly pulled the two darts leaving no evidence other than the unconscious bodies.

As they dashed down the stairs, Chuck said, "I better go and reboot again."

When they reached the corridor, they separated. Chuck rushed to repeat what he had done earlier and manage to get the security system back up and running smoothly before the main doors opened to the public.

He quickly ran up the stairs to help Sarah get Casey back down and, after she drove off, went back to the control room.

Vasillis was pacing the floor, and was obviously agitated that the mask was still there. He was talking to someone on his phone. Chuck guessed there must be more men there. Sure enough, another two men opened that door at the bottom of the stairs. They would discover the two unconscious men at the top. He tensed then thought about it. It was inevitable that they would be discovered, but they probably wouldn't know who did it.

Chuck watched them for thirty minutes. The two newcomers carried the other two down the stairs and out of the building. Chuck couldn't see where, as there were no cameras on the outside. Vasillis got a call, presumably from one of those men and left, looking angry.

After that, all he saw were the guests admiring the mask. The false mask, he corrected himself.

He was just starting to doze off, when the curator came in, thanking him for ensuring the security system didn't go wrong again. The display was over and the curator activated the vault doors to close again. Chuck grabbed his bag and headed out.

When he got home, he saw Sarah coming out of Casey's apartment. "I left the mask safely in Castle. We'll examine it tomorrow." She walked over to him. Her tone became sultry. "You and I have unfinished business." She took hold of his grey tie and pulled him along with it.

Needless to say, he soon had the apartment door open and in no time they reached his bedroom.

Sarah helped Chuck with the removal of that tie first, then the rest of his clothes. She hadn't changed from the clothes she had worn earlier, so he quickly pulled down her skirt and panties, helped her remove the blouse, and they got down to the business she had mentioned. As always, it was the best business they conducted together.

Much as the sex in that control room had been amazing for Sarah, she had to admit that being completely naked together, and doing it in the comfort of his room, was so much better. She was on top, as before, but this time facing him. She was totally in control of pace and angle. They both enjoyed this.

Chuck joined her at the finish line, this time. Maybe he would again, as they continued into the night. She wasn't going to forget that there would be a tasting session at some point.


Next morning, Sarah and Chuck had bought coffee on the way in, so he knew that would reduce the amount of growls Sarah received from the older agent.

He gave Sarah a kiss while still in her car, and then walked down into Castle with her to see how Casey was after his ordeal the night before.

Casey was, not surprisingly, in a bad mood, but he had come to Castle to work. He had no intention of going over to the Buy More.

Chuck gave Sarah a sympathetic look and headed back up the stairs to leave via the Orange, Orange.

Sarah sat with Casey and they started examining the mask. They knew that it must somehow open, but it wasn't obvious how.

Grumpy Casey was getting worse with the frustration. After ten minutes, Sarah was getting grumpy herself. with Casey. She needed a trip to the rest room as she hadn't had a chance to go before leaving Chuck's apartment, so that would give her a break from Mr. Grumpy. As she headed out, she said to Casey, "Don't open it before I get back."

Casey just grunted.


Because Chuck was away from the Nerd Herd desk when a call came through, Morgan answered it, "Hello. Nerd Herd."

A man with a foreign accent said, "I'm calling from the museum."

Morgan was surprised. It wasn't like Chuck to disappoint a customer "How may I help you?"

"We are still having problems with our computer system at the museum. Perhaps I can talk to the man you sent last night."

Morgan looked around for Chuck. "Uh, he's not at the desk at the moment." Then he spotted Chuck walk in the front door. "Hang on, he's just coming back."

When Chuck reached the Nerd Herd desk, Morgan thrust the phone into his hands. "Someone wanting to talk to you."

Chuck took the phone and said, "How can I help you?"

The foreign accent came through clearly, "You can bring me my mask."

Chuck tensed. "Uh, I think you might have the wrong number, sir."

"Let me rephrase. Either you bring me the mask or my men and I will come to you and kill you, your colleagues and your girlfriend."

Chuck Thought quickly. If the man came over to the Buy More, Casey and Sarah could intercept him, thus protecting all the people in the store. "Sir, like I mentioned earlier, this is the Nerd Herd desk, so unless you have a computer-related..."

"I wanted you to bring the mask to me, but as you are being difficult, we'll come to you." He ended the call.

Chuck couldn't go wandering out of the store again, so he rushed into the AV suite, opening the trapdoor to get to Castle.


Sarah was just heading back, when she heard Casey muttering something. Then, the glass doors sealed her off from where Casey had now leaped up.

On the desk, a canister, with white gas pouring out of it, lay a short distance from the mask.

She looked beyond Casey, who was now coughing, to one of the monitors that displayed,

Contamination
Cyclosarin

As she looked at this, Chuck appeared beside her. He saw the display too and flashed on the name. It was an extremely toxic substance used as a chemical weapon. The counteragent had to be inhaled. "It's poison, Sarah."

She looked at Casey would didn't look good.

Chuck continued, "It's a designer weapon developed for battlefield use, but there's a counteragent that can be taken up to hour after exposure."

"Or what?" Sarah asked.

He looked at her, "Death."

Sarah started to panic, but was surprised to see Chuck staying calm. "I think the counteragent is coming to us."

He quickly told her about the call from Vasillis.

"You and me against however many arrive, Chuck," she told him. That changed his expression.

"They'll be going into the Buy More!" he said.

"Not if you wave the second false mask." She pointed to a bag that was thankfully their side of the glass doors. "Then they'll come over here," she said.


Chuck was surprised that it went as well as it did. He also surprised himself with how confident he'd felt at the start.

When Vasillis and three men arrived at the Buy More. Chuck called out to them from across the parking lot. He wasn't sure that his voice would carry all the way, so he'd stopped half way between the Buy More and the Orange, Orange. Sarah hadn't liked that idea when he'd mentioned it, but knew that he was right.

Vasillis wasn't the one who spotted Chuck, but one of his men did, pointing over at him waving the false mask. Chuck had expected them to rush over to him, but instead they all jumped back into the car, obviously intending to drive over. Chuck panicked and turned and ran in the direction of the yogurt shop.

The car stopped between Chuck and his destination. All four men got out, three of them pointing guns at Chuck.

"Just walk slowly over and hand it to me," Vasillis said.

Sarah was very happy with this outcome. She was at the side of the Orange, Orange, hiding behind the bins. Now, Vasillis and his men had their back to her. It couldn't be better. She slipped her gun into the back of her pants after lifting out the tranq gun Chuck had given her. Killing men in the parking lot did seem extreme.

Chuck did what Vasillis had told him having noticed Sarah behind the men. He was only half way to them when the three armed men slumped down. Vasillis heard one of them when he hit the car as he fell. The leader turned sharply to see his men on the ground and Sarah walking toward him, gun in hand.

"Hand over the counteragent, Vasillis," she said.

He looked at her. "Why would I do that?"

"Because if you don't you'll die along with your men," she replied.

He looked down at the bodies around him. On one of them he obviously noticed a dart. "You haven't even killed these three," he said who scorn dripping from his voice.

"Well, I'm out of darts, so you'll take a bullet," she said, while aiming her normal pistol at him.

Vasillis looked panicked. "I don't have the counteragent. It was sent in one of the vases at the museum."

"Which?" she asked.

"I don't know," Vasillis wailed.

She grabbed the tranq gun from behind her and shot him. "Oops, I obviously can't count."

They needed to get the men out of sight and into cells in Castle, as well as getting the counteragent for Casey. Chuck helped her carry them into the yogurt shop, but then she said, "You go. You need to find the vase. I'll drag these down the stairs."

Chuck wanted to stay and help, but knew she was right. He ran over to his Nerd Herder and set off.

Sarah was surprise when she heard Casey's voice through her earpiece. "Poison's been contained. The room's cleared… Where are you?"

She replied, "I've got some unconscious Castle cell inmates to introduce to their new homes. Chuck's just set off to get you the counteragent from the museum."

"I need to break the glass to get out of here. Then, I'll help you. I can drag deadweights."

Sarah chuckled and pulled the first man down the stairs.

With Casey's help the four men were quickly locked up. Then, Sarah took him to the museum. She wanted to return with Chuck, so drove Casey's Crown Vic. He didn't argue.

Once they reached the museum, Casey was starting to look rough and even staggered a bit.

Sarah slipped his arm around her shoulders and helped him. When he didn't object, she knew he was struggling.

In the museum, she gently lowered Casey down onto the floor, and then she set off to find Chuck. He was running around a room full of vases, looking at each in turn. He heard her walk in and turned to look at her. "They must be priceless, Sarah."

"Not as priceless as Casey's life. We have to find that counteragent," she replied. She reached for the nearest vase, planning to smash it.

"Stop!" Chuck cried out. When she looked at him, he said, "One of these must be different."

"But which?"

Chuck restarted rushing around looking at each vase.

She looked at her watch. It was now fifty-seven minutes since Casey had been gassed. It was a good job she'd brought him here. Chuck would never have gotten back to him in time. However, they still needed to find the right vase.

Chuck stopped in front of one of the plainest vases there. An Etruscan Krater vase from the fourth century BC. He flashed on it and saw its details, along with the fact that it had been stolen. "This is the one, Sarah."

He picked it up and upended it hoping the counteragent would drop out, which it obviously didn't.

Sarah grabbed the vase off him and threw it to the floor. It shattered. She bent down and picked up a tube that had been exposed. Then, she rushed to Casey, opened the end of the tube and said, "Open wide." Casey did so and she poured the liquid into his mouth.

While Casey recovered, Chuck and Sarah went to see what had happened to the curator. They found him tied up in the control room.


When they got back to Sarah's room, Chuck asked something that he'd been thinking about. "Sarah, is there any reason we should keep our relationship a secret from Casey and Beckman."

Sarah hadn't considered this. She sat at the table and thought about it now. Chuck sat opposite her.

She eventually looked over at him. "Beckman might think it's unprofessional, but there's no rules against it, now that you're no longer an asset."

He grinned. "I'll always be an asset to this team, Sarah."

She leaned over and lightly slapped his arm. "You know what I mean."

"Yeah, I do."

"And you know I'm not just with you because of that computer in your head." He nodded. She suddenly couldn't help teasing him. "However, that asset between your legs is very important to me."

He unzipped and pointed to his opened fly. "This asset?"

That was all it took. She was suddenly on her knees paying him attention that he was very happy about.

After a short while, much as he liked her mouth, there were other parts of her that he felt needed as much attention, so he pushed her away and ripped open her blouse and then pulled down her skirt and panties.

He'd not been so rough or so fast before, and Sarah loved it. Then, he pushed her back onto the bed and rather forcefully took her. He slid his hand down between them and helped her join him at the finish line.

She cried out his name and wrapped her legs around him, crossing her ankles to make sure he stayed in her favorite place.

Once she got her breath back, and she could think straight. Sarah more fully answered his question from before. "We should tell Casey first. He is our partner, after all."

"He's probably already worked it out," Chuck said.

"Yeah, he probably has," she agreed.

"What do you think Beckman will say?" he asked.

"She'll probably disapprove, but I think she'll will accept it. We are still her best team, after all."


A/N: Next chapter will cover "Chuck Versus the Fake Name" but will have no naming problems. Not sure when I will get to publish it though, as I still have a lot of other stories in progress. Be patient.

Please drop me a review to let me know what you thought of this chapter.