GF Kinky Loves Pain

My current GF, got super kinky once we moved in together. I found out it was just hidden before. She loves being hurt. Spankings that are light, prequel to sex aren't enough. She wants to be spanked hard, hit with rulers, paddles, anything. She wants pain and cums from it. I have never hit a woman, never spanked one before, much less did all she wants. She is constantly bruised on her ass, I can't paddle or beat that ass enough for her, when using her special belt for her ass, or the riding crop if it cuts her skin, she goes nuts and cums as I take a little blood from her ass and put it on her lips. She has started begging me to abuse her beautiful tits now too. She has such firm, ripe, pert, D cups and she wants me to whip them, and punch them. If it were up to her, she'd have bruises and scars all over her ass and tits all the time.

I'm just not used to it, but I do it for her. I was never one to have much anal with girls, but she begs me to ram her butthole hard and fast. I know it hurts her but she cums squirting out of her pussy wetting all over the bed. I want her to enjoy sex, but I have to come to some compromise with her. I don't want my GF's body all bruised all the time. This summer, during bikini season, I wouldn't give it to her as hard as she likes, but it's almost like she wanted the bruises to show. I wrote in black magic marker, "butt slut" on her lower ass cheeks, and "whore" just halfway across the top line of her bikini bottoms, so it would show halfway. She loved it.

I now have "pain" over one side of her nipples, and "slut" over the other. She wears it like a badge. She actually went to the grocery yesterday in a very light material blouse so the writing could be seen in the right light. I'm living with a verifiable pain slut. I guess I'll get used to it. I'm getting used to rough fucking her ass a lot too.