Swingers stories and erotic fantasies

I travel into London reguarly on the tube. Recently it has been very busy, really crowded carriages. The other day when I got on I had a large holdall with me, which made it a real tight squeeze getting on. I didn't have much room to move when I got in. At the next stop more people managed to push in. The person behind me kept brushing up against me as the train moved along. I realised after a minute it was happening even when it was moving smoothly. Then I started feeling something keeping touching my ass. As I did'nt react it became more regular and lasting longer.It felt like the guy was moving his cock up as close as he dared to my ass. I decided to play along and the next time I felt it I pushed back hard and kept it there, I could feel him getting bigger and harder.
I started grinding my ass into his cock. He managed to pull away which was disappointing. But then I felt something between my legs he had pulled away to get his dick out and push it back. I reached down and felt this huge knob between my legs. Because we were all so tightly pushed in no one could see what was happening. As I started wanking him he slid his hand down the back of my trousers and started fingering my ass. We did this for a few minutes then I felt him trying to pull my tousers down at the back, I loosened my zip and he started to open my cheeks so he could push his cock in. As he went in I let out a moan and the person in front gave me a strange look.He only managed to fuck me for a couple of minutes as at the next stop alot of people started to get out. But I really enjoyed the experience.