I have had three reasonable two girl experiences in my life.
Unfortunately none appear to be working any more.
I saw a couple of girls in Coventry in my early years of punting which was quite entertaining. I subsequently saw one of them a few times after that, from memory her name was Emma.
I saw a couple of girls in north nottingham, that came about from seeing a girl a few times and after the punt talking about experiences and life. She would tell me stories about a friend of hers who worked I looked her up on AW and saw them both one night.
My last experience was with two milfs in derby, if you like dirty fucks then these were up there with the dirtiest I have ever had. Shagging one girl from behind whilst her friend is sitting on her back letting me finger her whilst I kissed her, then telling me to fuck her friend up the arse was quite an experience, especially when she held my cock as I pushed it in.
I have also had some absolutely wank experiences with girls who realily weren't bisexual in the slightest and also didn't seem overly interested in me.