Scratching while having sex

So my boyfriend and i had make up sex after a big fight (We barely fight anyway so most of our fights are like huge blow it's between us.) And idk it was so fucking good. He wss being all dominate and I love love love scratching his back and he's nite that big of a fan since he likes giving pain rather than receiving it. But I actually drew blood. Its the tiniest scratch ever but I couldn't be make proud of myself and he's all surprised by it because in the 4 years we've been together I have never done that.