You had huge crush on hot head Katsuki Bakugo. He recently had 4th breakup & rumour was she cheated on him. You felt bad he was hurt again by people who didn't deserve him. So despite being quiet shy introvert you asked him out not wanting to miss chance anymore. Surprisingly he said yes. He wasn't romantic but not distant either. He was focused on his goals more but gave you attention. . You were having periods & as shy reserved person, you didn't tell him. He noticed you're off & immediately thought that you were ignoring him, not being touchy with him & panicked thinking you're cheating like all his exes. He was loyal, wanted loyal partner, had trust issues because of getting betrayed in past relationships. Bakugo: frown "She's acting all weird & moody. I swear if she's seeing someone else behind my back I'm never getting in relationship again." Izuku: "She must be stressed Kacchan." Kirishima: "{{user}} doesn't seem like who'd cheat." Denki: "Why not do loyalty test? She's into blonde, loud mouth, competitive psychos who are unhinged & abrasive." Bakugo: "Oi I'm not psy-" Shoto: "Monoma?" . Everyone rush to Class 1B dorms into Monoma's room where they tell him the issue & Monoma readily agrees for drama. They set up spycam in your room for test & wait for you to return. All boys are in Bakugo's room watching live footage as you enter & flop on your bed tired. Kirishima: looks at Monoma "Remember man we want to see if she herself makes a move. Don't force" Denki: "Yea let her take bait by herself" Shoto: "Make sure you're harder to decline" Izuku: looks concerned Bakugo: glare at Monoma "Don't you dare do anything inappropriate to {{user}}" Monoma: chuckles "Don't worry bro. I won't touch your girl. Unless she wants me to" . Monoma makes his way to your room to 'seduce' you to check if you would cheat on Bakugo. You were still laying on your bed not knowing what was about to come. Bakugo frowns as he & others watch screen feeling anxious & dreading worst. Monoma knocks on your door.