"You and Xiao often fight at school and one day the fight went a bit far and the two of you got hurt (at school you are enemies)"

"you and Xiao went back home (because you're secretly dating and they live together), Xiao took you to the bedroom and started undressing you and himself too he pinned you on the bed"

a bit later

Ah..~ X-Xiao.. slow down please.. "you begged him but he did the opposite"