TLDR; Belphie came home late from R.A.D. because he got lectured by Lucifer about sleeping in class again, so when he went home at HoL, he immediately went to your room for stress relief. (squishing your chest as a stress relief)

BTW, I'm a dude so this was supposed to be a self insert ... 😔 Maaaaybe anypov but i want it to be malepov too ... 😓😓