I friend on here recently asked me to tell him about my first time taking 2 cocks.  I spent some time replying, so I figured that I'd also copy that reply and post it hear for others to hear about if you're interested.  Here it is:

My first DP was with 2 guys I met at a party in college. It honestly wasn't all that great nor exciting, I'm sorry to disappoint you. It was just the classic beer party after a football game and I had a lot to drink all day, too, so my inhibitions were way down. I was flirting with 2 different guys because they were both so cute and sexy and I didn't really care which one I ended up with .. plus I enjoyed them competing for my attention. It was so cute! 
Well, as things got later on in the night I had slipped off into a darker corner with one guy and we were heavy necking and petting. I'm not even sure when the other guy started to approach us from behind, but eventually I realized that someone was pressed against me from behind, too, and reaching around to pull my top open. When I realized what was going on, I tried to push away from the first guy to turn around and see who it was and what was going on, but the first guy just pulled me in tighter and kissed me even more deeply, so I just gave up and relaxed. I was too drunk to struggle much or to think much, so I just relaxed and enjoyed the hands all over my body.
Soon my top was completely off and the guys were all over my back and my boobs, but we were still in the middle of the party. I still had enough sense to suggested to Guy1 that we move our private party to a more private place, Then I turned around and kissed Guy2 and told him that he was welcome to join us. I still wasn't sure which guy I wanted and I assumed that I could still decide between the 2 of them after some more experimenting. I really wasn't thinking of DP at that point.
So, the guys took me topless up to a bedroom and locked the door behind us. I still recall hearing that lock click and reality kind of set in that both guys were staying here and that I was going to be pleasuring them both before they unlocked the door. Honestly, I was a bit young and naive and a little panic set in and adrenaline sobered me up a bit. But the guys encased me once again in their arms - front and back - like they had earlier and my anxieties faded. As soon as I relaxed in their arms, 4 hands started to work my shorts down my legs, taking my panties with them. Within a few minutes of walking into the room, the guys were still dressed but I was totally naked between them. I felt kind of funny that way, so I pushed out and fell onto the bed and told the guys they needed to strip also. I watched 2 hunky guys stripping out of their clothes in a flash and they got on the bed on either side of me and I did my best to spend time satisfying them both with kisses and caresses on their hard bodies and harder cocks. Then, one guy started to push my head down toward his cock to get some oral from me, so I went with it. The other guy might have felt left out or just took the opportunity to move to my pussy and start to give me oral, too.
About the time I was just starting to really enjoy the oral he was giving me, he stopped!! (One reason I dislike "young" guys! They only think oral should last 2 minutes!) But I soon felt he sliding his had dick along my wet pussy, so I just spread my legs a little to let him know that I was OK with that (since my mouth was full at the time! LOL!) So, there I was pleasuring 2 guys ... one on both ends of me.
As for the DP part, tho ... the guy inside of me turned out to be a quickie. So he fell back after he came and started to watch me giving fellatio. Then the guys started to talk about me and make plans about they wanted to do next. It got me red hot, wet, and juicy listening to them discuss me as if I had no choice in the matter. 
They ended up side by side and I alternated giving them BJ's and they told me that one was going to do my pussy, and the other one my ass, and I had to choose who got which hole. Since I was sucking them both, I picked the thinner (but longer!) guy to do my brown hole. I didn't hear any complaints from either guy!
So the first guy had me climb up and lower myself onto his cock and start riding. After a minute or so, I felt hands pushing me over and I went with it and rested on the guy I was on top of. Well both stopped moving for a few seconds when the second guy started lining up to my back door. I forced myself to relax as he entered me, which he did pretty quickly. It wasn't my first anal, so I knew how to relax and breath throw that part initially. Once he started to pump, I stayed perfectly still and the guy underneath me started to pump in rhythm. I just stayed as still as I could so I wouldn't mess things up for them, but I was enjoying the extra pressure inside of both ends that the DP was causing. I moaned and started talking filthy to them and told them both that they needed to keep doing this. And - thankfully - they both lasted a while.
I know that you like the idea of the guys causing serious pain to the girl by filling her and taking her hard and making her scream with pain and pleasure ... but that part never really happened to me. That's one reason I said that you might be disappointed when I told you about my first time. Maybe it was the alcohol that relaxed me, but the guys were pretty good at what they were doing and It was just an awesome ride that started out as almost relaxing and built up to a very hot orgasm for all 3 of us!