Dude literally the same thing happened to me, all these people saying "nah no way Jose" are tremendously dumb no bamboozle.

I went to a party and this chick with the massive coconuts asked me if I could get her a napkin to clean up a spill on her chest

"Let's be for real they're gonna be dirty anyway [hinting very sexually]"

"... you don't know that! (Looking down as if she knows I'm right) Do you want to keep them clean for me then?"

Literally a couple minutes later we're doing it like animals and after like a full hour (crazy performance that day) when I was almost done I pulled out onto her chest and looked her in the eyes and said "told you so" and walked out. Her face was absolutely astonished, angry, and impressed all at the same time!! Not to mention very tired.