Dodged A Bullet

Back Story:
I met Lisa a few weeks ago, and we started dating. It went well for the first few dates, and even though she's a bit younger than me, we had a lot in common. Third date, we ended up in the back seat of my car. From then on, every time we got together we ended up fucking. Lisa seemed to be very into the relationship until she suddenly told me we needed a break.
Thoroughly confused, I asked if we could find a quiet but public place to talk about whatever was bothering her. We ended up at the beach, sitting on a bench watching the sunset. After some BS small talk, she finally told me that although she likes me, she isnt happy with our sex life. She's only gotten off once, and thats when I was going down on her. Lisa then went into the " it's not you, it's me" and I shouldn't be hurt, this has been why she doesn't do relationships. I kept asking, what it is that she wants or needs different. Show me, I'll try to change. We ended up on a blanket on the beach with promising her I'd listen to whatever she told me.
We were hidden away in the dunes, and I was eating her out, determined to get her off. Everything was going great for me when she took her fingers and spread her lip to expose her clit. I started licking and kissing it until she told me to bite it. Huh? So i did. Nibbling gently and she got a little demanding telling me " Bite me". I started biting a little and Lisa told me " BITE ME HARD! CHEW ME!" when I did, thats when she stiffened up and let go. She covered her mouth but I could still hear her moans and grunts. Finally, she almost squeezed my head off as she crossed her legs and rolled over. I looked at her, all sweaty and she had me lie back and said she was going to return the favor. It only took a few minutes until I shot my load and she took it happily.
The next time we got together, we were at my apartment and she was on top. As we were both getting close she told me to pinch her nipples hard. When I did, she started grinding telling me to cum with her. She had handed me the key. She's not a masochist, she's not into pain exactly, but that momentary distraction lets her orgasm. She needs that trigger to let go. The next few weeks, she was great. Explaining different things that helped her. Slaps, biting or pinching were becoming standard, and Lisa was comfortable guiding me to help her.
Well, last Friday she had a Gynocologists appointment. I got a phone call I needed to come to the office. The doctor had me come into her office with the nurse to answer some questions. Apparently, she saw the bruises and bite marks and wanted to know if I was abusing Lisa. Embarrassed, I had to explain that the marks were not only consensual but her idea. I'd never do anything to hurt Lisa. The Doctor left and the nurse explained that Lisa told the same story and the Doctor will add it to Lisa's file. Scared the shit out of me!