For me it's when I'm on top riding him and he'll grip my hips and moan, "Oh God yes, fuck me." Over and over and it gives me this sense of dominance over him when he begs me to fuck him like that. Those words get me everytime and I'm ready to cum in seconds.
Big-haired Bitch/Personality Hire
I love when he knows that I'm just on the brink of losing control but I'm trying to hold back, and he deliberately says the filthiest thing that comes to mind to push me over the edge. It's never anything specific, it's just all about the timing.
"What is the quality of your intent?" - Thurgood Marshall
I want to fuck you forever.