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.
I extended my right arm to run my hand along Mandy's thighs. I then guided my hand to Mandy's pussy, and added my fingers to stimulating her labia. I wanted to put a finger inside, and asked, twice, "Mandy, honey, are you okay with fingers inside?" before she heard me.
"Oh, yes, Daddy, please!!" she finally answered. I started with one, as Suzy focussed on sucking and licking Mandy's clit.
The moans were getting louder from both of them, and I could feel my own orgasm getting closer. I thrust into Suzy faster and harder, and added a second finger into Mandy.
When Suzy pulled her head away to scream out her second orgasm, I thrust my thumb onto Mandy's clit, rubbing it round and round, then I heard Mandy's orgasm start, just as I came into Suzy, shot after shot after shot of cum saved up over the previous week.
As I pulled out, Mandy stopped me, grabbing my dick and started licking it, intent on cleaning me. She then stuck her tongue back into Suzy, seeking out more of my sperm. For a virgin who apparently preferred women, she was turning into quite a cum-chaser. I turned myself around, so I could watch, and also give her some pointers, as she licked Suzy to a third orgasm.
Suzy finally had to cry out, "Stop, I'm too sensitive!"
Mandy and I turned around, and lay to either side of Suzy, and proceeded to kiss her, and clean Mandy's juices from her face. They were subtly different from Suzy's. Then Suzy and I did the same to Mandy, tasting some of my sperm in the mix.
Mandy started giggling, finally saying, "I'm SO glad you talk in your sleep, sis! That was sensational!"
Suzy frowned, still upset that she'd let the secret slip, then decided to get back at her by saying, "A prick inside you is even better, honey! Daddy wasn't my first, but he is the best lover I've had. He'd treat you nicer than any boy your own age. Think about it."
"I know he would, because that's the kind of man he is," Mandy said, giving me a kiss on the cheek. "But that's the problem - he'd spoil me for any man my age. I'm tempted, but for now, I'm sticking to my decision."
I said, "Mandy, I hope you would never feel that you can't find a man who'll love you like you deserve, because of your involvement with me, any more than I'd want to interfere with Suzy and Nick's relationship. I was once a bumbling virgin, too. Worry less about finding the man who'll stir your loins, and focus on finding the man who'll touch your heart, then you can teach him sex and what pleases you. That's the foundation for a good marriage, in my opinion, even if your mom and I didn't last. And you can tell Nick I said the same, Suzy. Your heart is what matters first."
"Aw, Daddy, you're still a romantic", Mandy said, kissing me. "I love both of you, and if I didn't want Mom even more, you'd never get rid of me!"
"Oh, gawd!" Suzy and I said, together, then laughed.
Suddenly, we all felt hungry, went to the kitchen and finished off last of the birthday cake, putting robes on first. We then piled on the couch, and put on some silly teenage comedy movie. The girls decided they wanted to blow me, instead of watching the movie, Suzy helping to teach Mandy how. She was a fast learner. In the back of my mind, I thanked Sandra once more for teaching Suzy.
They traded off regularly, and I wound up warning Mandy I was about to come, but she kept her mouth on me, and did a pretty good job swallowing most of that load, Suzy licking up what she missed.