soulincontrol - Paintbrush Blowjob Challenge

Location: ManyVids. Lily has some very stiff-bristled paint brushes that she wants to use on my penis. She tells me that if I can withstand all of the brushing that she wants to do, she'll finish my blowjob and let me cum in her mouth. If I give up and tell her to stop, I get a ruined orgasm and have to eat my own cum. Every alternation between her mouth and the paint brush makes me more and more sensitive. Her lips and tongue bring an incredible sense of pleasure and relief, but there remains an underlying sense of dread, knowing that soon I'll be feeling the agonizing contrast of the paint brush again. With every stroke of the brush, my frustration builds, and I come closer to giving up. Will I get to cum in her mouth, or will it end up in my own mouth?