if someone tried sticking something up my ass and I didn't want it there (notice the didn't want it there statement.. LOL ) I would slap the shit out of them and then squeeze the crap out of both balls bringing them to there knees before I would allow it. That whole Don't stop shit is for pussies. Serioulsy... Say what you want and want what you say.
Myself ... if I don't want him to stop I put it quite frankly... "don't fucking stop fucking me! ........ I can't get any more graphic, there are kids here.