The house today was empty, I wandered into my younger sister's room hoping she had left something lying around, lucky today, two pairs of panties. I p...cked a pair up, I couldn't resist sniffing them, the beautiful aroma of her pussy was still just evident. I couldn't help myself, I had to try them on, not for the first time, they fitted to perfection. I then tried on the other pair, these were dark blue and her aroma was far more pungent. It crossed my mind that she had been masturbating in. “You do remember you shared me with Ellie last night, right?”Samantha giggled as she stripped off her clothes, “You have your tongue and fingers, too!”I undressed and we fell into bed.“Rebecca almost asked you to screw her,” Samantha said as I slid into her. “You had her THAT excited!”“She told me beforehand she needed to be a virgin for her husband, so there’s no way I would have done that!”“When she talked to me and Ellie, I told her to tell you beforehand if she was sure she didn’t want to. She's ... she's like us."In exasperation dad exclaimed, "Is there nothing you two won't do?!"Lisa surprised me when she smiled and answered quietly, "No, daddy. Not much. Nothing we've encountered so far. We even like the things we don't like, if you can follow that logic."Much to our surprise, he grinned, nodded in mom's direction and said, "I've become quite familiar with that strange need. Your mother is the same way."After our lengthy and detailed description of our sexual escapades to date. As I stepped into his bathroom, I caught a glimpse of myself in the large bathroom mirror. OH shit! I looked like death warmed over. I don’t know what I was expecting. Having stayed up all night. I brushed my fingers through my blonde locks and decided to make the most of things.I slipped out of my uniform and down to my panties and my bra, and then I jettisoned the bra. My nipples were rock hard in anticipation of what was to come.I opened the door to the bathroom, clad only in my soaking wet.