As the set went on the music was becoming far more bass driven, with long low bass lines vibrating throughout the venue. The jumping about had been re...placed with slow, rhythmic dancing with people losing their insecurities under the strobing lights. As the basslines continued I suddenly became aware of a grinding against my crotch. Looking down I noticed the two girls dancing, slowly moving their hips to the beat, both seemingly lost to the music. I tried not to focus on the grinding sensation. "Holy FUCK!" I blurted and sat on my bed covering myself with a pillow. "Where the hell is Dad?!!"My mom looked like she was gonna be sick. "We had a fight...I think. He could be back any minute". She stood up, holding a pillow over her tits and holding her mouth with one hand. "Put something on for God's sake. We'll talk about this tomorrow.." She gagged and almost threw up. When she did, her pussy made a gurgling noise and my cum streamed down her thighs. "Oh my God" she said as she went to. “Have you ever made love with a woman during her period?” I nodded. “Then you know it gets messy.” I again nodded. “But I wasn’t planning….” “Neither was I…but that’s OK.” She took my hand and led my back towards the bedroom. She stood at the foot of the bed. “You better get something to lay under me so we don’t ruin your sheets. I need to go to the wash room.” I got a towel from a closet. I pulled the blankets back lay the towel down. I removed my shirts and briefs and lay down. Lee came from. "Getting better," she said, as she put a finger on her pussy. I gave my cock a few strokes in front of her, but had to stop as I heard the other coming. As my brother in laws girlfriend sat back down, my mother in law announced, "Oh good, bathroom is free. My turn." As she walked past me, she gave me an intense look, that beckoned me to follow. "Looks like I need another drink too, I said, and followed her inside. The bathroom is directly across from the kitchen, and as I opened the fridge to.