Last weekend we went to a wedding and were invited to stay with friends of the bride's parents. They were a retired couple with two young sons who were back from London for the wedding. We arrived on the Friday night and went out for dinner with the family. We had quite a few drinks before before heading back to the house to sleep before the big day. Before bed my girlfriend commented on how nice the family were and how much fun the brothers were (they were roughy our age). I could tell that she fancied one of them but I didn't make a big deal out of it. The next day we went to the wedding. It was a really fun after party and we all got pretty drunk. We left around midnight and got a ride home with the family we were staying with. My girlfriend sat next to one of the brothers in the car and flirted with him relentlessly. We arrived back, said goodnight and made our way to bed. My girlfriend was super h**** and before long we started undressing and kissing hard and talking dirty. I asked her outright if she wanted to f*** one of the boys and instead of answering she just rode me harder. I told her to go and get him. She stopped and looked at me for a few seconds, then threw on a nightie and left the room. 5 minutes later she came back with not one but both brothers. My heart was pounding with jealously and l*** and the guys looked confused and nervous. She made them stand against the wall, took down their boxers and sucked their c**** one after the other. What ensued was one of the most insane sexual adventures I've ever experienced. They groped her, kissed her, f***** her and emptied their c** into her. At one point I fell asleep and woke back up to find her kissing and slowly f****** the one she fancied. She was so into it; kissing him deeply and riding him hard. In the morning we all had breakfast together and their parents then left for the day. We stripped her naked in the living room and took it in turns to lick her p****. We casually f***** for the next few hours, waking around naked the rest of the time. Now I find myself thinking about it all the time and want to repeat the same thing again. S** hasn't been the same either. I think it will happen again soon.