Experience Tumblr like never before
Trans virgin Remus Lupin, who isn't quite ready for the whole being penetrated by a real living penis thing, but is still the hornist mother fucker out there.
His significant other invests in a vibrator that they will randomly slip into his underwear and maybe tie him up in a way that he doesn't have control of where the vibrator goes and how much pressure is applied.
Once their happy with how Remus is set up they'll leave him there and sit across from him jerking themself off while Remus rips through his probably second or third orgasm already.