My girlfriend and my buddy

Im 29 and my girlfrind is 25. shes a petite cutie with c cups, I am 5'10 and 7 inch cock. A few weeks ago my girlfriend asked me if i had any fantisies. I told her I was kind of nervous telling her. When she finally got it out of me, I told her i always wanted to tag team her with another guy, This really turned her on. She imediatly started sucking my cock and talking about how she wanted to be fucked my buddy while she sucked my cock. She said she wanted me to watch him fuck her. I almost came instantly. A couple days later we went to the porn shop and picked out a 9 inch realistic looking dildo, that night i was in for a show. That night i was on the couch watching TV and she came in wearing some black lingerie and carrying the dildo. She asked me if i was ready to watch her suck rob's cock (my buddy's name), of course i said yes. As she was looking up at me while sucking that huge dildo (she made it about 6 inches down) i almost came in my pants. She asked me if this is what i wanted, and i said yes. She told me she wanted to be my little slut and would do any thing I wanted. So i pulled out my cock and told her to suck both of our cocks. She used the suction cup on the dildo and stuck it to the wood on the couch and began sucking my cock while stoking the dildo. I then told her to get on all fours so rob could fuck her. I helped her guide the dildo in her wet pussy and put my cock back in her mouth. I fucked her mouth as she fucked the dildo. the whole time she was telling me how good robs cock fellt in her pussy. I then grabed her, threw her on the couch and spread her legs and began to fuck her. I then grabed the dildo and began to fuck her mouth with it while i was fucking her. she beged rob for more. I slid it down her throat till her eyes watered. Finally i told her i was going to cum. She said cum on my face and I shot a huge load all over her face. Weve done this kind of roleplaying a few times now and both really enjoy it. we want to have another guy join us for real just dont know how to bring it up to a friend. Hopefully soon this will hapen.