If you haven't seen S13E10 you might not understand the Donna comment, but I'm not sure if I should really call it a spoiler...

After he had driven to the hospital, he waited while Morgan got her shoulder checked out. She came back only half an hour later and showed him a little white box. "I got painkillers, that's all for now. Doctor says it's a small infection, nothing to worry about, but nothing he can do something about either. I need to take these for a while and then I need to see a physiotherapist, but then everything should be fine again. I probably just overdid it a few times when I was working out, that's all."
"Don't tell Liz, she won't be happy to hear that!" he said with a small smile. To his relief, Morgan smiled as well. "Yeah, that's probably a good idea!"
Then her smile disappeared and she looked at him seriously. "Thanks for taking me here, Greg. And I'm sorry I snapped at you a couple of times, it wasn't your fault that my shoulder and arm hurt. I was just in pain and that doesn't happen to me very often, so I was just…"
"Not yourself?" Greg suggested. She smiled at him. "Yeah, I guess that's kinda the best way to put it. But I shouldn't have taken it out on you, you were only trying to help. I'm really sorry. Think you can forgive me?"
The way she looked at him made it impossible for him not to forgive her. Why did she have to be so beautiful and sweet? He tried to sound as normal as possible when he said: "Yeah, sure", but he was almost convinced she had heard the little shake in his voice.
"Let's go see Liz," he quickly said. He let the way to Liz' room on the third floor and saw she was awake this time.
"Hey," he smiled. "How are you feeling?"
"Obviously like I've been shot," she replied. She smiled at Morgan. "Tell your Dad I know how he felt after he had been shot."
"I will," Morgan promised.
"How's your shoulder?" Liz then asked. Greg saw Morgan's eyes grow larger in astonishment. "You've just been shot and then you want to know how my shoulder is doing?"
"Yeah, that's why I asked."
Greg smiled, recognizing Liz' cheerful voice. "You're going to be just fine!"
"I have to be. You still need to join one of my classes!" Liz said, her eyes full of seriousness.
"When you're all better again, I'll join them for an entire month," Greg promised her. Liz gave him a satisfied nod. "Excellent! Now, are you still going to answer my question, Morgan, or do I need to get out of this bed first?"
"Don't you dare!" Morgan warned her, which caused Liz to smile. "Don't worry, I'm not going anywhere yet. Getting shot isn't exactly pain free! But how are you?"
"I went to see the doctor and I'll be fine again," Morgan told her, quickly looking at Greg. "I got some painkillers and once my shoulder is feeling a little better, I need to see a physiotherapist."
Liz hadn't missed the look Morgan had given him, Greg noticed. He decided to quickly change the subject before she could say anything about it.
"Can you tell us what happened?" he asked. Liz shrugged one shoulder. "Nothing much. I went downstairs to get batteries when I suddenly heard a shot. Next, I felt this huge pain in my side."
"Do you have any idea who shot you?" Morgan asked. Liz shrugged again. "It all happened so fast. And then it just hurt."
"Liz, Las Vegas Happy Cakes is your favorite store, right?" Greg asked. Liz nodded. Carefully he asked: "Where you there two weeks ago?"
"I go there at least twice a week, so I probably was there two weeks ago," Liz said, pressing her hand against her side. "Why?"
"Do you know anything about a shooting at Las Vegas Happy Cakes?" Morgan asked, also sounding very careful. Liz shook her head. "No, doesn't ring a bell! And if something had happened there, I should know, don't you think? I think I'm keeping them in business all by myself!"
She laughed, but then pressed her hand against her side again.
"We'll leave you alone," Greg decided. "Come on, Morgan."
He softly pushed Morgan out of Liz' room. As soon as he had shut the door, Morgan whispered: "She's lying!"
Greg nodded in agreement. Something just didn't sound right about Liz' answers, but why would she lie about who shot her?
"Let's get back to CSI and check out the surveillance tapes," he suggested.
"I'll check the tapes, you check her clothes," Morgan nodded. "Maybe we can find out then why she isn't telling us the truth!"

After they had arrived back at CSI, Morgan went to the AV lab, while Greg took another look at Liz' clothes. When he looked more careful at her black dance pants, he found a black hair on them. It could be a coincidence of course, but he still ran the hair for DNA. The result caused him to look at the screen twice. The computer had found a match, but it wasn't a 100% match. It was a familiar match… and it matched to Liz' DNA.
"Greg, come and see what I found!"
He turned around and saw Morgan, her eyes beaming with excitement.
"Come and see what I found," he said, pointing at the screen. Morgan stepped into the DNA lab and looked at the computer screen. She nodded and whistled softly. "So you found a hair that belongs to her father… who lives all the way back in Australia. That's strange!"
"You found something," Greg understood after those last words. She smiled at him. "Oh, yeah! Come and take a look!"
She took him back to the AV lab and showed him what she had seen on one of the tapes from the fitness room. It showed Liz talking to a man with black hair, who looked a lot like her, which ended in a small, almost innocent looking fight where Liz pulled out a handful of the man's hair. She dropped them on the floor, but one hair obviously had stuck to her dance pants. What happened after that wasn't visible on the tape, but it wasn't hard to guess as the man followed Liz.
"Her own father shot her," Morgan told Greg. "That's why she wouldn't tell us anything at the hospital, she wants to protect him, even though he shot her."
"Why would a father shoot his own daughter?" Greg said, shaking his head. Morgan shrugged her shoulders. "I have no idea…"
Suddenly she realized what she had just done. Smiling she looked at her shoulder. "Hey, I guess those pain killers are really working!"
Greg smiled back at her. "That's good to hear! But I still think we need to go back to the hospital…"
"I know…" Morgan sighed. "Time to confront Liz with what we found!"

As soon as they had told Liz about the hair and the tape, she nodded. "Okay, I lied, I admit it. I do know something about that shooting at Las Vegas Happy Cakes and I do know who shot me."
"Why didn't you tell us immediately?" Greg said. "Steven Winwood is dead, you do know that?"
A tear ran down Liz' face. "I know… I'm sorry, I didn't mean for him to get shot… My Dad… He was after me, not after Steven! He shouldn't have killed him…"
"Why did your Dad want to shoot you?" Morgan asked, a demanding tone in her voice. Another tear ran down Liz' face. "He has wanted to kill me ever since I was little… My parents split up when I was ten and I chose to stay with my mother. He hated me picking her side and tried to kidnap me a couple of times. Finally, my mother and I moved to Australia. My Dad didn't know about it until my mother and stepfather made the paper because they had the biggest family in town: eight kids, including me. My Dad appeared in town only two weeks after that newspaper article. He first tried to talk to me, but when I told him I hated him for what he had done to me, he started to beat me up. If there hadn't been any bystanders, I would have been dead already! My mother then decided it was better for me to leave Australia. I had just started my fitness training, so I asked my trainer a good place to continue. He suggested I'd come here, which I did. I was safe here until I became instructor of the month. My Dad saw the article in the sports magazine about me working at the gym and about how much I loved to bake cakes and get supplies at Las Vegas Happy Cakes, so all he had to do was wait until I went to the store again. I saw him just in time and managed to escape, but this time I couldn't just run away. I saw him when I came downstairs and tried to ignore him, but when I saw his gun, I went over to him to tell him to get out. He tried to get me to go outside with him, but I pushed him away and pulled out some of his hair, hoping it would make him leave. Well, you know it didn't…"
"Why didn't you tell us immediately?" Morgan softly asked.
"He's my Dad," Liz just said. She leaned back into her pillows and stared at the ceiling. Suddenly she pushed herself up. "Greg, look out!"
Before he realized what had happened, he felt an indescribable pain in his shoulder. Next, everything went black around him.

When he opened his eyes again, the pain was gone. He carefully turned his head towards his shoulder and saw that it was covered in bandages. When he looked up, he saw Morgan smiling at him. "Hey… You're finally awake."
He tried to gather his thoughts, but he just couldn't remember what had happened. Or where he was for that matter. He looked around and realized he was in the hospital.
"Liz' father found out where she was," Morgan told him. "He tried to shoot her, but hit your shoulder instead. The hospital security managed to arrest him, Brass has already questioned him. He has confessed to everything: the shooting at Las Vegas Happy Cakes and shooting Liz and Steven at the gym. You were right, he was only after Liz, Steven wasn't the target. He was just in the wrong place at the wrong time. The very wrong place and time… He didn't have a family or kids, so at least they don't have to deal with all of this. Of course it doesn't justify what Liz' father did to Steven, but for me it always makes it a little more terrible if there's a grieving family."
Greg slowly nodded, he understood what she meant. He stared at the ceiling, trying to process what she had told him and what had happened.
"The doctor said you get to home soon already," she changed the subject. "I was actually kinda hoping you'd be able to help me a little until my shoulder is all fine again, but I guess it's going to be the other way around, don't you think?"
"I'll be fine," he told her, sounding a little grumpier than he wanted. She smiled at him. "Where have I heard that before?"
She slowly took his hand in her own hand and smiled at him again. "Liz thinks we make a great couple now we both have an injured shoulder. But I had to tell you that this is no excuse for you to miss her class once she's better again!"
Greg wasn't sure if the smile was really visible on his face. His heart was beating nearly four times as fast now that she was holding his hand and the pain in his shoulder had suddenly disappeared.
"So, what should I tell her?" Morgan asked, still holding his hand. She softly ran her thumb up and down it, which caused goose bumps to appear on his arm. He tried to get his voice under control when he said: "I'll join her class as soon as my shoulder is fine again."
"That's not what I meant…"
She was still running her thumb up and down his hand. When he looked at her, she just smiled at him. "I meant the other part of her comment. The part about us being a great couple… Remember Donna saying she thought we were cute together as well?"
"I… remember…" He almost didn't recognize his own voice. Morgan just smiled at him again. "Come on, Greg, do you really want to deny it any longer? Don't you remember your horrible attempt at flirting with me when we first met? I know for sure that I'll never forget it! I was too worried about having to face my Dad at the time to realize, but looking back, I kinda fell in love with you right there and then… I just didn't find the courage to tell you until I saw you there in Liz' room with that blood all around your shoulder. I then realized I had to tell you before…"
"It was too late?" he finished the sentence for her. She nodded hesitantly. "Yeah, I guess… Maybe it's a little dramatic, but with the job we do, I guess anything can happen… I don't want to lose you without ever getting the chance to tell you how much… How much I… love you…"
She spoke softer and softer with every word, but he had no trouble hearing what she said. His mind had a little trouble processing it, though. Had she really just said that she loved him? Almost automatically he reached out with his left hand to his right arm to pinch himself. Morgan smiled at him. "Don't worry, you're not dreaming. I really just told you that I love you, Greg. I was just kinda hoping you'd say something back instead of trying to pinch yourself…"
He moved his left hand up to her face so he could pull her close.
"I love you too," he just managed to say before his lips were covered by hers. He already knew he'd try to pinch himself a few more times in the near future, because this really felt like a dream.
"Once the doctor sends you home, come over to my place until your shoulder is healed, okay?" she whispered in between kisses. "I'll help you with whatever you can't do alone, because I know from experience you can't do everything by yourself with only one good shoulder!"
"Isn't that kinda like 'the blind leading the blind'?" he said with a small grin, his hand still in her hair. She smiled at him. "Maybe… But I more thought of it as an excuse to spend time together…"
He pulled her closer again. "You can keep on thinking of excuses like that in that case… I know I'm going to love all of them already!"

A few days later, he was released from the hospital. He moved to Morgan's apartment like they had agreed on at the hospital and he soon stopped pinching himself after that as he finally realized Morgan really did love him as much as he loved her. Living together with her felt so natural as well that when his shoulder was healed, neither of them mentioned him going back to his own place. It was actually Nick who first brought up the subject when he saw Morgan reaching out to a tea glass on the top shelf with her right hand.
"I guess your shoulder is all better again as well," he said. After Greg had been shot, Morgan had confessed her own shoulder problems as kind of a cover story for her and Greg being together.
"Oh, yeah, it's fine," she nodded, putting down the tea glass.
"Well, I guess Greg's going back to his own place then since there's no use in him helping you out anymore," Nick suggested. Greg tried to keep a straight face, but Nick of course saw through it. He laughed. "Come on, when are you two finally going to admit that you're not just together in Morgan's apartment to help each other out? You're living together, so what? I'm happy for you two!"
"Do you think…" Morgan started, but Nick already shook his head. "I can keep this to myself? Not a chance! And besides, I think everyone in the lab already knows! Next time you might not want to kiss each other in the locker room…"
He left the breakroom, leaving them looking at each other in amazement.
"There was no one around, how could he know?" Morgan stammered. Before Greg could say anything, his phone told him he had received a text message.
"Oh, it's from Liz," he saw. "Ah, she's back at work again today at nine and she expects both of us to be there!"
He looked at Morgan. "What do you say? Feel like working out?"
After a moment of silence, she nodded. "Yeah, sure. And then I feel like moving the rest of your stuff to my place… if you feel like it as well of course…"
"You mean like really moving in with you?" he hesitantly asked.
"Yeah… Unless you don't want to, of course," she quickly added. He got up and walked over to her. With a smile on his face he wrapped his arms around her. "I may have to start pinching myself again to make sure I'm not dreaming… Of course I want to really move in with you! I'm just not sure if today is the best day to move all my stuff because I have a feeling Liz is going to make us work very hard during her class today…"

He ended up being right: after Liz' class neither of them felt like that had enough energy left to move all of Greg's stuff to Morgan's apartment.
"An entire month, remember what you promised?" Liz grinned when she saw the exhausted look on Greg's face.
"If I survive that long!" Greg sighed. Liz smiled at him. "Don't worry, Sanders, I'm sure Morgan will help you survive! She's used to doing my class!"
"Not anymore," Morgan groaned. "How on earth can you have that much energy after being shot?"
"It's part of the process," Liz said with a shrug. Greg shook his head. "I got shot too and I don't have that much energy!"
"No, of course not, you're using your energy for something else!" Liz grinned. Both with their cheeks bright red, Morgan and Greg looked away from each other. Liz grinned again before she grabbed her bag. "I'll see you both at the end of the week, okay? Enjoy the rest of your day!"
She left the aerobics classroom so Morgan and Greg were alone. Morgan looked at Greg. "What do you say? Feel like moving or do you wanna wait another day?"
"I think I've waited long enough to be with you," Greg answered with a smile while he pulled her close. "But I may need a little distraction from my workout pain first…"
Smiling, Morgan wrapped her arms around him. "Hey, that was the deal when we moved in together: I'll help you and you help me!"
With her face only a few inches away from his, he softly whispered: "I'll be more than happy to help you…"
After those words he closed the last few inches between them and kissed her. The pain from the heavy workout was already forgotten.