Fisting with unwanted cum

Today i bought a huge dildo for my strapon and i can't wait to use it on my strapon slut! because the strapon is huge, i wanted first, to make sure, my slave can get it all, inside his ass! so i decided, first to stretch his ass, and what's better than fisting? if i can get my fist inside his ass, for sure the giant strapon will go on smoothly! i begin stretching his ass, slowly slowly and yes, victory: i got all my fist inside his ass! i like this very much and being with all my fist inside his ass makes me horny so i fuck his ass with my fist while i rub his cock with my other hand. when i stop rubing his cock, few seconds later, i noticed , semen going out of his dick ! hahaha...it looks like i ruined his orgasm ! it wasn't my intention to make him cum, yet he did, so, being ruined orgasm is very good , because he is my bitch and he can't have pleasure without my approval! it looks like my fist inside him , gave him very strong sensations, because his semen is keep running out of his cock, minutes later …all in all, i am pleased! his ass is ready for my huge strapon now!