My girlfriend,we got together in the late seventies,normal going out and about like most couples,kiss and cuddles where ever we could.One evening she said she wouldn't be able to see me for a few days as she'd been offered overtime in the shop,ok thought nothing of it,good excuse to go out with the boys. Dave one of the boys said a new pub had opened about half hour from us, let's give it a try,we set off the next evening,it was great,modern for that era,as the night wore on I went to the loo,you had to go through another room, quiter than where we were,I looked over to see my girlfriend kissing another man,she couldn't see me,I couldn't believe it,her skirt had ridden up showing her stocking top and a bit of her white suspenders,I couldn't take my eyes off them,someone came up the stairs so I carried on. I went back down and they were still at it,I went back to my mates,but couldn't get them out of my mind,Dave said time to go,no I'll catch you later,they left and after half an hour the pub was closing,I left with the crowd and saw them walking to the bus stop,as they approached a bus just left,he looked at the timetable and said something and they sa t in the shelter facing a small park with there backs to the road. I crept around and found a spot out of sight,they soon got do to business,they started kissing,and his hand went straight under her skirt,no resistance,her stockings came into view and her knickers as he rubbed the front,I know had a hard on, her legs opened and from what I could see her was fingering her,I started wanking,she must have come as everything stopped. I Soon followed,they caught the bus and I had to wait for the next one. I lay in bed wondering why I wasn't jealous but turned on,what should I do,the chance of watching them was slim,I rang her at the shop and asked how things were, she said she was tired after long evenings,when can we get together,meet you usual time,ok.let you know the outcome.