Japanese swingers group fucking

My boyfriend and i were shopping when this woman approached me. she was promoting a place for couples and she wanted us to go there. all the food and drinks were free so we jumped at the chance. the problem is that when we arrived, the place was quite strange. there were just couples kissing everywhere, but then those same couples kissing other people. my boyfriend and i didn't understand what was going on until one of the couples explained to me that it was a swinger party. so, without knowing it, we were in an orgy.