Hot oral

So my boyfriend and I started making out and he wanted to go down on me. He slowly ripped off my clothes and kissed all over my body. I went to lay down on the bed and he was like "No, I'm gonna lay down" so he lays down and has me like sit on his face. I used the wall to support myself as he ate my out like crazy. I started moaning and he did too (amazing vibration). But I felt like extra movement in the bed, I look over my shoulder and he is stroking himself! It was so hot knowing he was getting off to me getting off. As I started to orgasm I felt him tense up a little and realized he was shooting cum on my back while he ate me out. My legs started shaking and it was one of the best things ever