>>61377124>lay on their stomach and hump the shit out of the mattressI don't know how to tell you this anon...
That's potentially pretty bad for your dick and can actually cause problems including ED and difficulty with orgasm according to some doctors and journal articles(a small amount desu). The only term I can find used to describe it is Traumatic masturbatory syndrome, kinda funny that even when masturbating Shioris fans need to do it traumatically 