The robe was gapping apart its full length and I could now see that Mom was completely naked. She wasn’t even wearing panties!Surprisingly, Mom’s ...endulous breasts lost my attention. Even those magnificent orbs couldn’t compete with the slash of hair now visible, now gone, then there again as the robe flapped across Mom’s front. She picked up Dad’s glass and very, very slowly held it up to look at it in the kitchen light on the ceiling behind my head, the light that wasn’t even on. The robe. "Really?" Yeah." Did you like it?" Sure," I admitted with a smile. "It's different, but ... you know. Exciting."Her gaze narrowed, and she gave me a knowing smile. "It turns you on, doesn't it? Me and your mom?" Yeah," I confessed, staring at the table in embarrassment, my heart suddenly throbbing. It did, too. How could Vicky have figured that out, much less tricked me into admitting as much to her? Shit, I hadn't even realized it myself -- but once the thought had been voiced, it seemed. I think I heard her mumble, "I'm supposed to be the one having sex tonight!" as she stepped back out of the room.The door burst open again. "Wait a minute, what the heck is going on? You're both here!? It smells like sex... oh my God, are you having a threesome?"Lena explained the situation. Apparently, her "arrangement" with Val was news to Francine too, even though it had been going on for a year under her nose."You guys are so lucky, having all this sex tonight. I've been saving myself. Why don’t you and your husband join us,” he offered.“Wow I’ll check with him and see if we can get a sitter. Can we bring anything?” I replied trying not to sound too excited.“No just your bathing suit, but thank you for asking. Anytime from 1:00 PM on will be fine. It will be Dirk, Anna and a few friends,” he continued. “I’ll look forward to seeing you and meeting Peter”.I had heard about his place and that it was something special. The house wasn’t some mansion but it was impeccably decorated.