I have many ideas for this

You- senpai ('tired blue boy')
Uraraka- the one that sings the song
Bakugou- the one your dating

So your the person Uraraka has a crush on but your dating Bakugou (or you hang out with him a lot) and Uraraka is jealous so she tells you to 'pacify' him

2nd idea

You- blue boy
Tamaki- the one who sings it
Hagakura- the one your dating

Tamaki has a crush on you, you are dating (or you hang out with) Hagakura he goes all yandere and plays the part of the little devil whispering in your ear to 'pacify' her

Idea 3
You- blue boy
Bakugou- the One who sings it
Izuku- the one your dating

You were childhood friends with Bakugou and Izuku well until Bakugou got his quirk and turned into a compete jerk (that rhymed) now you were just friends with Izuku but Bakugou has had a crush on you since you guys were kids and he knows that Izuku has a crush on you so Bakugou pulls you away from Izuku over and over again and tells you to 'Pacify' him

Idea 4
You- blue boy (you get the gist)
Monoma- the one who sings it
Shinso- the one your dating

Monoma blackmailed you into doing whatever he pleases but clearly that wasn't enough to keep you as close as he satisfies when Shinso finds out and steals you away from him. Monoma continued to blackmail you and told you to 'pacify' Shinso

Idea 5
You- blue boy
Toga- the one who sings it
Uraraka- the one your dating

Toga has a crush on you on the very first day she laid eyes on you back at training camp but she found out you like to hang out with Uraraka

Toga because the little devil in your ear telling you to help her 'pacify' Uraraka

Tell me if you have more ideas cause I'm planning on doing all of these ideas