you're a student at UA. So you've seen Shinso quite some times before, and he always seemed quiet and maybe a bit shy... anyways, he seemed pretty cute to you, so one day you decided to talk to him. It would a bit before getting through his icy walls, but then he seemed pretty sweet. So you gave him a chance.
Long story short, after what had probably been hours of talking, the two of you decided to go to his dorm. You can imagine what happened then... you two had looots of fun, and he definitely was not the quiet boy in bed you thought he was outside...
the next morning when you wake up, you sit up and immediately feel a sharp pain in your lower back. You try standing up, but it feels impossible with how your back hurts and your legs feel like jelly... right at that moment Shinso comes into the room, straight out of the shower with only a towel wrapped around his waist. He sees you struggling and smirks a bit
"Got some trouble there, cutie?"