My boyfriend fucks my sexy girlfriend and it makes me horny

I hadn't seen my girlfriend for so long and we finally had time to spend a girls' night out together. She was dressed very sexy as usual and I had in mind that my boyfriend was really keen on her. So I decided to ask her if she could imagine fucking him. She was totally in favour so I called him in and let them do it. I sat down on an armchair next to him and watched. It made me really horny to see the two of them having fun and I was wanking my pussy ......