WARNING: A bit of potty language, right at the start (thank you so much, Raph). Also, I'm not sure with the answers of the math problems, okay? Tell me if any of them are wrong and I'll correct them ASAP! :D
There were a lot of things that Donatello's brothers didn't know about him at first. One, surprisingly, he knows how to use all of their weapons. Two, he had already created retro mutagen that could turn him human for a certain amount of time. And three…his girlfriend wasn't exactly a "good girl".
It was a beautiful night this evening. Most friends and family would be outside and enjoying the stars and the fresh air. (Y/N) and Donnie, however, are known for not being like most people.
"Okay, so if x = 16 and y = 27.4 then y(x – 45) + yx is…?"
"831.8." (Y/N) answered proudly. "C'mon, give me a hard one!"
"Hey, I didn't make these, remember?" Donnie smiled. "It's your book giving you an easy time. If it was me, I'd probably give you a full on test right here, right now."
(Y/N) pouted. "Now that's not fair."
"All is fair in love and war, my dear…"
The two jumped suddenly, hearing banging from the door. When Donnie opened it, Raph came barging into the room, nearly toppling over the scientist's test tubes.
"What the fuck is this?"
(Y/N) looked up from her homework that they were doing, seeing the hot headed turtle holding up a picture of a girl kissing a brown haired boy. The girl was holding a bright red cup in her hand, and both people in the picture look drunk. The girl looked a lot like (Y/N).
(Y/N) sighed in exasperation. Beside her, Donnie tried to hold in a snicker, but failed.
"I told you he'd find it and blame you." He teased.
She grumbled. "Shut up."
(Y/N) walked over to Raphael and grabbed the picture of him. She flipped it over and shoved it back to his face.
"If you'd check instead of immediately rushing over to blame me for something I didn't do, you'd see that this picture was of (Friend Name) with the date of last Halloween, and who did I tell you guys she was dressing up as?"
"You," Raph muttered.
(Y/N) hummed. "Now, she got almost everything down, from the hair to the clothing style, and plus, I guess the lighting does make her look like me a lot."
Raphael stood sheepishly at the doorway, rubbing his neck and looking anywhere but at the couple.
"Uh...sorry. For thinking it was you who-"
"It's fine," (Y/N) assured him. "I know you're just looking out for your brother; I get it, you don't want a repeat with April. We're cool."
Raph relaxed his shoulders and smiled. "Thanks for understanding."
Just as he was about to leave, (Y/N) called him back. He looked over his shoulder with a raised eyebrow.
"You know I'd never do anything to hurt Donnie. You keep saying I'm too much of a good girl, remember?"
Raphael cracked a smile. "Of course you'd never hurt him, good girl."
The door slammed shut. The moment the hot head terrapin left, the two burst out laughing.
"How did you manage to come up with that," Donnie wheezed, "And still not be able to answer your Chemistry homework?" (Y/N) was too busy guffawing to answer properly.
"I wonder if we could still sneak out again to another party." (Y/N) mused. Donnie pecked her on the cheek.
"We have to," He reminded her. "Your friend (Trev, was it?) dared us, remember?"
The girl beside him looked over with raised eyebrows. "I thought you said you didn't want to go to any party in the first place?"
"You're a bad influence." Donnie shrugged. "But, I guess it's not necessarily a bad thing. At least…maybe not in this case. We only want to have fun, right?"
(Y/N) bit her lip. "I'm starting to get t'ya, huh?"
The mutant closed his eyes and sighed. "A little bit. " He admitted.
Donnie opened his eyes in surprise when he felt her wrap her arms around his neck. He hugged her back, nipping at her collarbone.
"It's okay," (Y/N) murmured. "I don't want to stop this. I want to show you everything you've been missing out on in the life of a teenager."
"But (Nickname)…"
"We could show your brothers later," She insisted. "For now, I just want this life to myself and my boyfriend. Sneaking out and partying 'til dawn isn't exactly what Leo would approve of."
There'd been the slightest of hesitations on Donnie's part.
"Okay."
But he still said yes, of course.
BONUS:
"By the way, "good girl"? Really?"
(Y/N) grinned as she played with his bandana tails. "Oh, don't you know, Donnie?"
She pulled the tails down, taking his head with them and whispering in his ear.
"Good girls are bad girls that haven't been caught."