Disclaimer: All sexual activity is between adults. Enjoy.
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"There's no easy way to ask this. Are the two of you having sex, y'know, with each other?"
I don't know what my face looked like, but Suzy's went pale. "Yes," I whispered. Honesty was the first rule of the circle, and I knew we were caught, somehow, and denying it would only make things worse. Taking a deep breath, I said, "But I guess you already knew the answer to that?"
"Pretty much," Mandy said. "Little things I noticed between you two weren't adding up, but the clincher was last night when Suzy talked in her sleep again. Hearing her say 'Fuck me, Daddy, harder' and a few other things made everything click. By itself, I could have thought she was just having a fantasy dream, but not combined with how nervous you've both been acting, Daddy."
"I'm sorry, Dad," Suzy said.
I squeezed her hand. "Oh, sweetie, don't be. We should have known it would get figured out eventually by someone as perceptive as your sister."
"But that's not the only reason I called for the circle," Mandy said. "The second reason was to let you both know that I'm okay with it, and you don't need to hide it from me any more. Incest doesn't bother me. I actually think it's hot when two people who shouldn't love each other can't control their attraction. I got SO turned on thinking about the two of you last night, listening to Suzy. Oh, gawd, so hot."
Suzy and I both gasped. After a moment, Suzy asked, "Is there a third reason?"
"Yes, this." Mandy leaned over and kissed Suzy right on the lips, and kept kissing her for 20 seconds more, tongue obviously involved.
"Wow," said Suzy, when Mandy leaned back. My dick was hard as steel.
"So, am I next? And are you wanting into my bed, too?"
She treated me to the same kind of kiss. She was fantastic. When she finished she was still holding my hand and said, "Actually, Daddy, the weird part of that second question is my birthday wish yesterday actually was to make love to one of my parents..."
I knew immediately. "Except it wasn't me you had in mind, was it?" She squeezed my hand in confirmation.
"Mom??" exclaimed Suzy, eyes wide.
"Yes, Mom. You get to be horny for Daddy, I get to be horny for Mom. I haven't made a move yet, because I'm sure she would have just used my being underage to say no, but I'm pretty sure I won't have any trouble getting into her bed once I go home from here."
My mind was spinning. "Your mom never mentioned she was into women, in all the time I knew her."
"Daddy, that might have had something to do with which woman she was into - it's Aunt Nancy!"
"What?!" I gasped. "When did that start?"
"I don't know." Mandy shrugged. "Might have started a long time ago, but it's definitely been happening since Suzy went to college and Aunt Nancy moved back here after her divorce from Uncle Larry. Aunt Nancy's been over the house a lot, and there were three different times when I got home from school earlier than normal and her car was in the driveway and I heard moaning coming from Mom's bedroom. Far more obvious than you two. I would just slip back out of the house and come back at my regular time, and they'd be in the kitchen talking like nothing had happened, or Nancy had left. And then there's the strap on harness and dildos I found in Mom's dresser," she giggled.
"So how do you plan to seduce her, Mandy?" Suzy asked.
"Simple. Come home unexpectedly again and catch them both together, then ask to join them both. It's not like Mom can complain that it's incest, if she's already doing her sister."
"That's true." I said. "But I notice you actually never answered my question about whether you wanted into my bed. Are you going to ask to join us, too?"
"Daddy, I hadn't actually thought about you that way, at least until last night. My thoughts have always been about being attracted to Mom and then Nancy, and a few about Suzy. But, my answer is I'd love to be with you both, except for one thing. I'm a virgin, Daddy, and I want to stay that way for my eventual husband. But if you're okay with fucking only one of your daughters, I'd love to help you do it to her. I could even learn a few things from you both so I have more experience. What about it, Suzy? Will you let me practice my pussy licking on you, so I can be better for Mom?"
Suzy looked dazed. "I... I... I... Oh, wow... Mandy! You want to?"
"Why not? You're hot, I love you, and now I know incest doesn't bother you either, obviously."
We adjourned the circle and went to my bedroom, got undressed, and still standing next to the bed, Mandy began kissing Suzy, while I got behind Suzy, my dick pressed against her ass, and started kissing her neck, while running my hands up her sides, caressing her skin.
I noticed Mandy's hands were just by Suzy's hips, so I took her right hand, and raised it to her sister's breast, and guided her in squeezing, first the breast, then the nipple, then let go so Mandy could continued on her own, and saw her do the same with her left hand.
I shifted my hips a little, grabbed Suzy's hips and pushed my dick between her legs and into her pussy, causing her to yelp into Mandy's kiss. She pushed herself back at me. Mandy noticed what I was doing, and helped me hold Suzy up, while her left hand moved to Suzy's pussy, exploring not only her lips and clit, but also running her fingers under my dick, as it slipped in and out.
Suzy was screaming out her first orgasm in under a minute, and her knees buckled. I guided us to fall sideways onto the bed, Suzy and I landing on our right sides, as I resumed stroking into her from behind, lifting her left leg and wrapping my left arm around it for better access and leverage. Mandy climbed onto the bed, turned the other way around, and moved her head between Suzy's opened legs, and began licking away, more enthusiasm than skill, but when your younger daughter's tongue slides across your dick while you're plowing it into her sister, you're not going to complain about technique.
Suddenly, Mandy moaned, and I saw that Suzy had pulled Mandy's hips toward her into a 69, and was going to town on her little sis. I leaned forward, and nibbled on Suzy's ear then whispered, "Wait until Sandra hears about this." She laughed, then resumed licking.