"Okay, Ochako," Deku began "Strip down to your underwear."
"Yes, Master." She droned. Ochako grabbed the bottom of her t-shirt and began to raise it over her head, revealing the plain, white bra beneath it along with her not underwhelming breasts. She then began to slide her shorts down her legs, bending over to drop them to her ankles before kicking them to the side. She then went back to staring blankly ahead in nothing but her white bra and panties.
While her underwear was plain, and he always thought she was cute, it wasn't until now that Deku realized just how sexy Uraraka was, and he knew he wanted to see more of her like this. "Listen Ochako, whenever your alone in your room or only with me in your room or mine, you never want to wear more than a bra and panties. In fact, you actually prefer thongs, you like the way they feel and you're proud of your butt and like to show it off. Also from now on, you sleep in the nude. Got it?"
"Yes Master."
Deku had an idea "Ochako, tell me our relationship."
"You're my best friend at this school and I have a crush on you." She said without emotion or hesitation.
Deku wasn't expecting that, but it actually helped him feel better about what he was about to do. "Actually, that's wrong. I'm actually your boyfriend and you're my eager, loving, girlfriend. In fact, you're the one who asked me out on the first day of school as a thank you for saving you in the entrance exam. We've been going out ever since, but we've kept it a secret. We didn't want the teachers to think we were distracting each other from our studies or our classmates to think we were helping each other to get ahead. But now you've been thinking that you want to go public with it. It makes sense, we're already at the point where we have sex regularly, usually with you initiating, but you never turn it down if I offer. Behind closed doors, you're actually very sexually open, you just don't like to let people catch on because you're embarrassed and don't want people to think you're a slut. But you don't hide it from me, you're open to any kind of sex, you love the feeling of anal, your actually like the taste of semen so blowjobs are enjoyable for you, and really any other sexual act you can find something to love in. Did you get all that?"
"Yes, master."
"Then summarize everything we've gone over today that's true about you." Deku ordered
"My name is Ochako Ururaka. I'm most comfortable in my underwear, especially thongs, which feel great and show off my amazing ass. I'll strip down to them whenever I'm alone in my room or with you, Izuku Midoria, my beloved boyfriend who I've been dating in secret since we started school together. Though I don't let others know, I secretly love sex, especially anal, and I try to do it with you as often as possible. This is probably why I sleep in the nude, because I'm always in heat."
I was surreal hearing Ururaka describe herself like this, but her rationalizing some of is decisions herself seemed to prove that she was fully on board. With that done...