i've had that happen to me at least a couple of times. the first time was when i was at a group party & i was spit-roasted, taking a thick 7" cock balls-deep in my ass while getting face-fucked - i was on my back & the guy fucking my mouth was kneeling above me, straddling my chest, & the big-dicked guy fucking my pussy had my legs pused way back as he pounded me hard, & they both blew their loads in me, one after the other. i was so turned on & hot (this was the first time i'd ever had two guys fuck me at once) that i shot my load all over my belly without anyone even touching my dick. it was THE most fantastic feeling i'd ever experienced up until then - taking a hot load deep in my ass, another flooding into my mouth, & my own cum spurting onto my belly, all at pretty much the same time, MMMMMM!!!

and i totally loved it!