Chapter 18

So, this is another chapter with a big BDSM scene. For those who aren't into that skip the middle scene here between the two scene breaks. Next chapter, we finally get to the confrontation that this arc has been building towards.


As was quickly becoming habit, they had their strategy meeting around the table after finishing breakfast. Rin had made them a delicious Chinese style breakfast, which she privately thought was one of her best showings yet. When the last of the dishes were put away the three of them gathered naturally together once more.

"So?" Shirou asked. "What's your plan?"

Rin sat up straight as all eyes in the room turned towards her. She didn't like how nervous she was. What she was about to suggest was not anymore intimate than what they did in the bathroom every night, but Sakura had been the one to insist on that. This had to come from her. That always got her feeling nervous. "I know you want Caster for yourself, but we need a weapon that will let us defeat Berserker. It's not that I don't have weapons capable of doing it, but none of them are something I have the magical energy to produce and use in the middle of a battle. Especially when trying to defend from that bear of hers. Unfortunately, I can't be the one to create it. So Sakura... it's going to need to be yours."

"Mine?" Sakura blinked, surprised as though she had been expecting to be mostly left out of this discussion. "Nee-san, are you talking about Pegasus? I told you... I don't have any way of summoning it."

"Yes you do." Rin said. Her face was getting a little red already, but she pushed through it. "I'm assuming neither of you have been taught this, but it's possible for magical energy to be exchanged through sexual intercourse."

Shirou's eyes widened, like Rin had guessed this was new information to him. Sakura's expression however was quick to darken. As Rin had suspected, this was not news to her. Rin didn't want to say anything that their Master might not have realized however, so she kept that information to herself.

"If I give a large chunk of my energy to Master and then he passes it along to you, that will be more than enough for our purposes." Rin said.

To her great annoyance, neither of them looked even half as embarrassed about the notion as she was. Sakura even smiled, her unpleasant memories quickly vanishing at the prospect of having sex with their Master. Shirou did frown a little, but it was clearly something other than the sex that was bothering him. "Wait, Rin. Wouldn't that make both you and Sakura lacking in energy for the battle? What will you do if something goes wrong?"

Rin nodded. She'd been expecting someone to point this out, it wasn't wise to put all of their eggs in one basket. She'd had similar misgivings which was why she hadn't brought this up earlier, but further discussion with Sakura had calmed her down. "It would be, if we went to fight them immediately after. But Sakura's Noble Phantasm isn't Pegasus himself. It's the spell that summons Pegasus."

"That's right!" Sakura said, realizing what Rin was suggesting.

"So, all we need to do is summon Pegasus today... and then make our attack tomorrow night." Rin said. Truthfully she didn't know if they would be back to a full 100% strength tomorrow, but they would likely be pretty close and if they waited too long they might risk getting ambushed once again."

"But do we know where to go?" Sakura asked.

"Illya said that she was from somewhere in the forest." Shirou pointed out.

Rin smiled. She'd figured as much, since the Eizenbern had a stronghold in there, but it was good to get some confirmation. "That's perfect. It's too much to search through on foot, but on the back of Pegasus we can cover the entire forest in no time. Of course, we'll have to make sure we only ride him overnight."

Sakura and Shirou shared a look, both considering her proposal. Rin wasn't nervous about this part. There wasn't any other plan, and she was confident they would accept. Shirou leaned forward, the intensity in his eyes... well, she couldn't deny how attractive it made him look. "It makes sense. Sakura, it's your Noble Phantasm... do you think it will work?"

"Ah, um –" Sakura looked more than a little unsure of herself. "You're my Master, so I'm fine with whatever you decide... but... I do think it would work."

"Okay." Shirou said. Rin saw the shift in him instantly. Once he had decided on something he was far too stubborn to ever back out. And now he'd decided to have sex with her. She bit her lip. "Let's do it, Rin. You're a good girl."

She wished, she really did, that hearing those patronizing words didn't make her heart want to do a flip while butterflies fluttered within her stomach.

Shirou rose, towering over his two Servants. "I'm going to go get the bedroom prepared. Come inside in fifteen minutes. And make sure you aren't wearing anything. In fact, strip right now."

Rin blushed. "Yes, Master." She quickly began fiddling with her clothing, removing it as he watched. She didn't want to admit it, but she was well trained by this point.

"Yes, Master." Sakura said, with a smile. She undressed even more rapidly than Rin did, and her clothing was on a pile on the floor before Shirou had even left the room.

X X X

Standing side by side with her equally nude sister, Rin knocked carefully on the door of their Master's bedroom. Her entire body was already tingling with excitement. She'd gotten used to going about her day in ridiculous outfits, but spending the last fifteen minutes entirely naked had been new and hard to adjust to. She'd felt completely exposed. And she wished that was a negative instead of a positive.

"Come in." Shirou called out.

Taking a deep breath, Rin pushed the door open and strolled inside, Sakura behind her. She wasn't sure what she'd been expecting, but the room looked more... normal than she'd been picturing. The cage was still there, but other than that it might have been anybody's standard bedroom. The only thing that looked different was Shirou, who was standing there shirtless.

He really was delicious looking. She'd felt those powerful muscles pinning her down before, and as she traced the edges of his muscles with her eyes she found herself wishing to repeat the experience. As she and Sakura ogled him, he did the same thing to the two of them. Rin felt a pleased smile touch her lips as he openly stared at her exposed breasts.

So far this was almost seeming vanilla. As vanilla as a threesome with two sisters could be at any rate. Rin was just waiting for the other shoe to drop now.

"Stand here." Shirou said, pointing to the futon. Rin and Sakura obeyed, and he gestured for them to turn around. "Good girls." He said. His hand coped a quick feel on Rin's ass, and she squeaked but held still. This was her role. He was her Master so he could do whatever he wanted with her. He pressed a kiss against the crook of her neck, and she held in a moan.

He crooked a finger towards Sakura who eagerly steeped towards her. With one hand playing with Rin's nipple, he kissed her sister deeply and Rin could do nothing but listen to the sound of their smacking llips.

This wasn't fair. She had to be first! For the ritual. Just for the ritual's sake, of course.

With one hand, Shirou pushed Sakura back into position. "Trace on." They both heard him mutter.

Rin gulped.

"Turn around." Shirou commanded, and the sisters twirled around obediently. "Rin, arms behind your back."

There was nothing she could do. Well, she could obviously easily escape but... she obeyed instead. As soon as her arms were behind her, Shirou's hands grabbed them and bent them into position. As soon as he was done, she felt magic being done behind her, nothing remotely on the level of what she was capable of but a quick, dirty, and effective casting that got the job done.

A roped appeared around her body. It wasn't tight, but it felt so real that she almost jumped. It was one of Shirou's projections, a primitive spell that he was somehow able to cast just as well as the Heroic Spirit inside of her. It ran along her torso, framing her breasts and wrapping around the arms that Shirou had twisted into a hand-bar position. It didn't run directly around her neck, instead running to either side and looping around on her front and back.

Shirou tugged, and Rin could no longer hold in her moan when the rope tightened all around her. Instinctively her body strained against the sudden restriction, but that only made the rope bite into her flesh all the harder. If she hadn't been a Servant there would have been no hope of breaking them. Shirou loosened the rope only a fraction before he tied it off.

Rin had never felt so trapped before. So completely and utterly defenceless towards somebody else's advances. And damn it, it made her face flare up bright red when she realized just how wet she was growing between her legs.

"Good girl. You're doing awesome, Rin." Shirou said. "Knees."

Rin whimpered but did as she was told, with a grip on the ropes binding her, her Master helped her get down onto her knees. Then she felt a hand against the back of her head that pushed her further down, until she was lying on her stomach.

Shirou's hands pushed her knees up, and this time Rin knew what was coming. She didn't do anything to stop it. Another rope appeared around her legs, tying her lower leg to her upper leg, and looping around the arm-bar at her back. She was effectively hogtied now, unable to move at all aside from thrashing back and forth. These ropes were just as tight as the previous ones had been, digging deliciously into her skin.

And then Rin could do nothing more than try to watch as Shirou did the exact same thing to her sister. From her position on the floor she could barely make out what was happening, but Sakura's much more open moans made it easy to keep up. At one point Sakura whispered something under her breath, which caused Shirou to chuckle and then smack her on the ass.

When both of the sisters were completely restrained, their Master knelt in front of them. Rin whimpered, resisting the urge to beg him to fuck her. To her surprise though, they weren't done yet.

"You're both doing so well. You're almost ready." Shirou said. He ran a hand through their hair at the same time. And then something else appeared, two things really, each in his hands. Rin's eyes widened in shock as she recognized what he was holding from pornography. It was a pair of ball bags, both bright red with a black strap.

Not – not that she'd ever looked at something like that. She just knew from word of mouth! Yes, of course!

Shirou took the first of the ballgags and placed it in Sakura's mouth, silencing the Servant's moan as the gab took away her ability to speak. He buckled it around the back of her head, smiling a little as he saw her begin to drool. Would he smile like that when it was her turn? Bizarrely, Rin found herself eager as Shirou turned his attention to her, and pride filled her chest as his smile grew in size.

The ballgag tasted like rubber, and filled the inside of her mouth to the point that she could almost smell it. It was tight around the back of her head, but not nearly as much so as the ropes. Still, she could only breathe in through her nose now, and her cheeks burned as she realized that she had no way to swallow. Like Sakura, a pool of saliva was already beginning to grow in her mouth.

Again, Shirou waved his hand and projected more perverted creations. Rin didn't recognize these, but they were two little pink devices attached to wires, almost like smaller versions of a computer mouse. What could –

Her silent question was answered when Shirou strolled around behind her, and gently placed one of them between her legs. Her scream was loud enough to give him a little bit of pause, but it soon switched into a moan as the device rested inside of her vagina. He did the same thing to Sakura, who accepted the intrusion much more obediently than Rin had.

"Okay. Here we go." Shirou said.

Rin heard something like a switch flick, and the device began to vibrate. She gasped and shook as her heart started to beat rapidly. But no matter how much she fought against the sensation she couldn't deny how wonderful it felt. The vibrator made her insides feel like they were melting, like someone was depositing pure pleasure inside of her.

She strained against her bonds, fighting back a moan. Her mind felt like it was on fire. Everything was so good. The restraints made her feel safe and free, even as they took away her ability to move and dug lightly into her skin. She was soaking wet already, and if she'd had the freedom to do so she would have started humping something. Beside her she could hear Sakura experiencing the same things she was, both of them moaning continuously into their gags as the steady hum of the vibrators continued.

Shirou walked in front of them, sitting down. "You two are beautiful." He said. Rin felt intense pride, but even more intense was her desire for cock. She would have taken it down her throat just as gladly as any of her lower holes. She just wanted him.

Which was why her confusion was so much higher when he simply sat down. There was tea pot against the wall that Rin had honestly not noticed until just now. Shirou checked on it with the back of his hand and then nodded to himself. He projected a teacup into his hand, fetched a tea bag from beside the kettle, and poured himself a cup.

Then he sat down to watch the two sisters shake and struggle as the vibrators tortured them with pleasure. Rin wanted to scream at him to fuck her already, but for some reason the realization that he was treating her situation as a personal viewing party... it only made her more excited inside.

The little dial was still in Shirou's hands. Rin heard a click and moaned even louder as the vibrator within her sped up.

To her mix of frustration and deep, deep, satisfaction, that continued. Rin's sense of time was quickly warped beyond recognition, so she couldn't say exactly how long it had been. But she knew he sure was taking his sweet time with it. Leisurely watching as the two of them were dragged to the very heights of pleasure, Shirou took long and slow sips of his tea and every now and then flicked the switch to make the vibrators go even faster.

Sakura screamed even louder into her ballgag as the first orgasm hit her. Rin listened with half an ear, knowing she wasn't far behind. She could feel it building deep within her, like the vibrator was consciously and slowly teasing it out. She'd stopped caring about the saliva that was pouring down her face, the disgusting nature of it only added to the humilation of being watched like an animal.

And the more she thought about that humiliation, the more satisfied she got. Shirou was just watching her, occasionally smiling as her or Sakura made a particularly loud noise, but everytime he did it made her heart skip a beat. Damn it, she was proud. She was so proud that she was making him happy, and so glad to know that he desired her. Even just to look at.

At that thought, the first orgasm tore through her. She'd masturbated before, but this was far more intense than anything she had ever been able to do to herself. Even without touching her, Shirou was able to do that to her easily.

Of course he was. He owned her, after all. Masters were good at playing with their toys.

Rin's ears practically twitched as she heard the clink of a tea cup going down. Her and Sakura's muffled moaning grew more intense as both of them tried to beg at once, crying out for their Master's attention.

She didn't know if her attempts at pleasing had done anything, or if he was just sticking to the earlier established order, but Shirou 's hands rested on her first. She wanted to scream with delight as he lightly swatted her backside and then pulled loose the soaking wet vibrator. She only had a few seconds to feel relief before a part of her bonds simply vanished into thin air. Her legs were free only for a second before Shirou was crawling on top of her.

Like a wild animal, she was mounted and penetrated without even getting the chance to say a word about it. Her nostrils flared as she moaned and squeezed her eyes shut to focus on the sensation. After so long being teased by the vibrator, his long and hard cock felt like heaven itself as it pushed it's way between her legs. Her inner walls welcomed him eagerly, almost religiously as he took his pleasure from her.

Even tied up and being tortured with pleasure, Rin was still a genius. As she felt her orgasm building she did her best to hold it back, beginning the ritual that would allow her to give him the magical energy he needed.

That was harder than it sounded. His pounding of her just felt so good. She was already sensitive because of the vibrator and the earlier orgasm, and the ridiculously hot situation itself, but even if she wasn't she was sure it would have been a struggle not to cum first. Shirou's hips barely paused, treating her like a piece of meat that he was extracting his pleasure from as he roughly pounded into her.

If she could speak, she would be begging for his semen. She was, actually, but it was inaudible through the ballgag.

Finally, finally, she heard him grunt. "Rin! I'm cumming!"

Her eyes widened as she finally allowed herself to feel the release. His warm semen flooded her insides as her body shook with pleasure, and the comforting weight of his body kept her stable as her mind tried to float away. She'd never felt better. Literally, she'd never felt more satisfied in her life.

Tied down, fucked silly, her eyes practically rolled back into her head, and laying there with a pool of semen inside of her, Rin sighed with pleasure. Her mind was oddly calm, she felt nothing but bliss and a sense of peace with herself and the world around her. Her Master could have done anything to her in that moment, and she would have gleefully accepted it.

Instead, he summoned another set of ropes and tied her legs back up. Again, she felt a sense of relief as the knot grew tight around her. It was perfect. He was perfect. She had the best Master in the world.

Rin listened with one ear as he began fucking her sister. She was happy for Sakura. As bad as it had been waiting for him to finish drinking his tea, how bad must it have been to listen to him fuck someone else while you were still so needy? But judging by the way Sakura's body was shaking, it must have only made her more excited.

This was the life.

X X X

It was a couple of hours later that the three of them gathered outside again. Rin was dressed now in her battle-gear, just in case something went wrong, and she was watching as Sakura performed the ritual.

Her mind felt like it was on fire. She was so embarrassed that she felt like she could have died. For at least an hour after the scene – as he'd called it – Shirou had been gently taking care of her and Sakura as they attended to their bodily needs and gotten some sorely needed rest. She'd been thanking him the whole time. The whole time. Some of the things that she'd said made her want to develop a spell to go back in time and gag herself to prevent her from being so honest.

She still wasn't sure what had come over her. She was both terrified of and ecstatic about the state of mind that had come over her during the sex and bondage session. She didn't know what it was, but she knew she wanted to experience it again.

Shaking her head to clear her thoughts, Rin turned her attention back to Sakura. A magic circle had appeared in front of her sister. Almost anticlimactically it worked. A white horse stepped out, beautiful and large with two angelic wings folded up on it's back. The horse neighed with delight as it saw Sakura, and Sakura and Shirou both were soon shouting with delight as the horse nuzzled into them.

Rin just sighed with relief. If she'd gone through all of that and this hadn't even worked she would have killed somebody.

Now all that remained was to rest. Tomorrow night, it would be time to take on Berserker and Caster. And Rin had to win. Her Master had requested it.