My girl was giving me a handjob the other night and I was asking her about her first orgasm. She was telling me the whole story and answering all my questions like she always does (this wasn't the first time we've discussed it at length, but it's my favorite story from her past, so we talk about it often). She was explaining how, after making out with the guy for several minutes, he got her laying down, got her shorts unbuttoned, got his hand down her shorts and started touching her pussy (again, all details I've heard from her before). Then she said that it only took him a few second to find her "good spot" and that as soon as he did she gasped, cried out, and clutched the bedsheets with both hands (again, I've heard these details already). Then I interjected to ask her how the guy reacted (not something we've covered before). My girl said "he just grinned...he knew he had me." I instantly busted, haha. I don't know what it was about that phrase but it was so insanely hot to me the way she said it and everything it implied about that moment, the tension, and the dynamic between them at the time (especially since he was just a random Tinder hookup). Now, a few days later, I can't get that line out of my head, haha. Every time I think of it I get instantly horny again and it's all I've been getting off to since she said it.

What do you think it is about this specific phrase together with the scenario that makes it so hot?