Hey! I'm not good at writing, so I'm going to type these starters and ideas I got from @LamsBaby. They're a great writer, so go read! Comment the pairing and an idea you have to go with it.
Category 1- Unsepecting crush/ best friend crush:
1- "God, you're beautiful... Huh? Did I say that outloud?"
2- "I care about you, you know that."
3- "I'm so glad I met you."
4- "I like them, I guess... But I don't know if they like me back."
5- "We're just friends... That's all."
6- "You sure don't act like just friends."
7- "I'm not jealous! I was just trying to look out for you is all!"
8- "Do you like them? I mean, uh-not that it matters to me or anything!"
9- "They're not good enough for you."
10- "I am so lucky to have you in my life."
11- "Dude, I am not being your wingman."
12- "do you think, um... N-Nevermind, it was nothing."
13- "I can't believe they thought we were dating! That's.. weird, right?"
14- "How many times do I have to tell you? They're just a friend!"
15- "Can i stay at your place tonight? What do you mean- That's not weird! Just a couple of friends having a sleepover, right?"
16- "Your boyfriend/girlfriend/xierfriend is a jerk. You know that, right?"
17- "Sometimes, I don't know what I'd do without you by my side."
18- "We're as thick as thieves! Platonic thieves, I mean!"
19- "What-you're really going on a date with that jerk?"
20- "Don't tell me you actually like them! They are so obviously just using you!"
Category 2- OTP drabbles:
1- "The doctor said that it's normal."~"Well that doesn't mean it doesn't hurt!"
2- "Baby, you're not a bother."~"I'm too needy, you don't deserve it."
3- "Come with me to another room."~"We are not talking about this now."
4- "Did you just hiss at me?"~"Are you judging me?"
5- "Don't yell at me like I'm a child!"~"DON'T THROW SCISSORS!"
6- "Here, take my blanket/jacket."~ I told you, I'm not cold." *shivering*
7- "Did you hear that?"~"I'm telling you, I'm haunted."
8- "I just wanted an easy day with my boyfriend/girlfriend/xierfriend. Is that too much to ask?"
9- "Why are you awake right now?"
10- "Come over here and make me."
11- "I want my best friend back."~"Kevin is over there."
12- "H-how long have you been standing there?"~"Long enough."
13- "You're blushing, you're lying."~"Shut up, no I'm not!"
14- "No, I'm not talking to you."