Hell yeah it's fun, me and two of my buddy's back in my senior year of HS ran a train on this freshman girl (a few times)... It was at most one of the best highlights of my life... I'll never forget the first time it happened, she had to sneak out her parents house window and my friend picked her up at like 3am down the street from her house. As me and my other buddy where waiting for them to pull in he kept telling me that she'd fuck all of us (which I didn't believe)... They showed up, we all did a couple lines and she went into the back room and starting fucking one of my friends with the door wide open. My buddy sitting next to me kept encouraging me to jump in on em, so I walked in the room and the girl just smiled at me while getting railed in the back. So I just crept up on her and she started sucking my dick at the same time as she was getting fucked doggy. Then one thing led to another and all 3 of us where taking turns beating that pussy up for hours. As homo as it may sound, it was the best bonding moment between me and my friends ever.