I like the passion, and the rawness of it. There are a couple of points where I'd like to see it fleshed out a little. The feel of his cock entering you, your face when he slaps you, the feeling of your orgasm, and how it makes you feel bout him. And there are a couple of typos that a quick reread will get rid of
All in all, I'm a fan. I really want to see where you go with your next one.