Never in a million years did Izuku think he would ever be in this position. His back was slammed up against the wall while his childhood best friend made out with him. That's not even the crazy part. The crazy part is that his friend used to be a guy, until last week. Now he's a very attractive girl. It was jarring to see his explosive bully/childhood best friend now a hot girl that has been secretly crushing on him. Before now, Izuku considered himself a straight man. He found enjoyment in women and didn't hold men in the same light. However, now he doesn't know what to think. Should he be happy she's a girl? Should he be sad he isn't a boy? What was he supposed to feel? Well, what he did feel was confused.
Katsuki, now a girl, pulled away from Izuku's lips. He quietly spoke in puffs of breath "Don't...get the...wrong idea...nerd. I'm just...mildly attracted to you."
Izuku could only muster a dumbfounded "Oh."
She cradled Izuku's face and said "I want to know how you feel, idiot."
Izuku began stammering "H-h-h-how I-I-I-I feel?! I-I-I-I-I" Izuku was interrupted by her slamming a hand into the wall. She enclosed the distance between them and collided lips.
After heatedly exchanging kisses, she spoke again "Fine. How did that feel?"
Izuku blankly stared into the distance "Great. It felt great."
The now dubbed Katsumi lightly slapped his check and responded "Good nerd. We're dating now." Then she walked down the hallway and out of the building. She left behind a confused and flustered Izuku Midoriya.
Izuku entered the classroom and slumped into his chair. The previous night had been devoid of any sleep. He spent the entire night trying to piece together a variety of things. His feelings. The events leading up untill the recent genderbending. His new acquisition of a girlfriend. He never did reach a conclusion. He only raised more questions and head aching dead ends.
Unbeknownst to Izuku, Katsumi busted through the door and scanned the room. Upon finding her new boyfriend, she stalked over to him. Abruptly, she pushed his shoulders back and straddled his lap. Izuku promptly lit up in a bright blush. He jerked backwards and felt the chair tilt. On instinct he gripped her hips in an attempt to balance himself. The chair rocked back down on all four legs. Katsumi watched Izuku realize the placement of his hands with a triumphant smirk. Before his stammering, she gave him a quick kiss. The action elicited a wide spectrum of reactions from their classmates. "Huuuuuh?!" "No way!" "Midoriya you traitor!" "Wait Bakugo's gay?!" "Is this considered gay or not?" Katsumi relished in the soft embrace.
She said quietly "I've been wanting to do this since middle school." Izuku's brain completely fried at the idea of angry Katsuki fantasizing about kissing him. He found he didn't dislike the idea entirely.
Izuku mustered his courage "I kind of th-thought you hated me."
She rubbed a hand on his chest and replied "Ya, I kind of did." Her response made his insides churn. "Then again, I didn't exactly understand why I bullied you so much until UA...It took me awhile to understand I liked you." She continued. Her confession added to his steaming red face.
Their attention was caught by the collective sigh of their classmates. The students shared a knowing smile. Mina spoke "I always knew you guys didn't hate each other."
MmKirishima interjected "I kind of already knew." Bakugo blanched at her best friends remark "Huh?!" He continued "Ya, I knew when I caught you looking at Midori. I do it sometimes too...Not to Midoriya though." His statement settled in the air. Mina gave him a discreet pat on the back.
Izuku spoke "That's great Kirishima. I didn't know you were so perceptive." He gave the manly man a thumbs up.
Suddenly the door slid open and Aizawa walked in "Alright class, today we-" Aizawa saw his resident hothead in the resident shy nerd's lap and turned 180 degrees. Aizawa walked out of the room while exclaiming "I give up. My class is cursed."
Izuku quickly found out that his girlfriend wasn't ordinary. Beyond the obvious reasons. First of all, she really enjoys beating the crap out of him. Second, she has zero self control. Finally, she has zero care for personal space or privacy. Multiple times before, she busted into his room while he was changing and caught him half naked. Every time, she muttered "Nice" and sat down on his bed. Then for the rest of the day she would observe him. She looked like she was trying to stare through his clothes and burn the image of his naked body into her memory.
Other times, she would challenge him to a friendly spar. After exchanging punches and kicks, maybe an explosion or two, she would trap him in a triangle hold. Tightly, she wrapped her legs around his head and pulled his face dangerously close to her groin. Also, she held his arm firmly between her boobs. Izuku obviously felt confused. The wonders of feeling the body of a girl, his age, for the first time in his life contrasted with the pain of her wrenching his arm in a way it wasn't supposed to go.
Also, Katsuki did whatever she wanted. No questions asked. If she felt like sitting in his lap, she would straddle him and steal his attention from whatever he was doing. Maybe she wanted his affection. Then she would forcibly wrap his arms around her and pull him closer than normal. Most times, it would quickly escalate to a full blown make out session. One time, it reached high octane petting.
Over the following months of their wacky relationship, Izuku wrestled with the idea of what would happen if Katsumi became a boy again. Would he still want to date her/him? Would it be weird? Would he feel a certain way? Slowly those questions were answered.
One day, Katsumi had decided to have a date somewhere other than the gym or one of their rooms. She roughly pulled him along but their linked arms. Before long, they explored the various games of the arcade and checked out the boring stores. When they began to wrap up their excursion, two familiar boys showed up. The two boys laughed at passerbys. They then saw Izuku linked with Katsumi. Quickly they made their way over "Hey nerd, what's going on here. You going on a date? I bet you paid her, huh Deku? Maybe she felt really bad for you. Or maybe she just wants to-" The chubby boy with wings was interrupted by Katsuki's fist.
She then spoke "Hey, Jackasses. Take your stupid somewhere else. Me and Deku here are on a date." The boy with long fingers slowly realized something "B-B-bakugo?!"
Katsumi crackled small explosions in her palm "Yeah. It's me, Assholes. Now get lost." The boys scramble away frantically. When Katsuki turned to apologize, she was interrupted.
Izuku slammed his lips to hers and muttered against them "Thank you, Kacchan." Briefly her eyes widened. Gently, she wiped away a few small tears that fell down Izuku's cheeks. She mouthed back against his lips "Don't worry about it nerd." Izuku finally realized that he was in love with Katsuki Bakugo. Be it Man or Woman.