Trans Henry being super horny (ovulation is a bitch) and getting off all the time and Alex having to stifle his moans so that Henry doesn’t hear Alex jerking off to him.
Alex thinks Henry’s little moans and whimpers are the hottest thing ever, but he just can’t hold himself back when he hears him moan out his name when he cums.

He’d knock on the door and be like “you’re killing me, baby” while his dick is rock hard and tenting his boxers. Henry’s breath stutters and he squeaks out a little “what?” And Alex would explain that he can hear him getting himself off every night and he chat fucking sit back and listen anymore, especially not when Henry is calling out his name. Henry tries to apologize but Alex doesn’t let him finish, interrupting and telling him that he’s been getting off to it too. Alex promptly rails Henry until he can’t walk straight for days after that