Has happened a couple of times...
Just reached under and held his balls, so he couldn't pull out, stroked the bit between his balls n asshole with my fingers which made him blow his huge load deep inside, grunts, moans, groans n feeling big hairy balls unloading, what more could u want?? Don't care if they say poz or neg, always think of them as poz.... some get off on saying it last minute, makes them thrust harder n deeper, and some that say it are not poz! They just want to see ur reaction, knowing that ur usually helpless to do anything about it.