Tell them that to avoid anyone being left out, they will both get your attention

You walk in the front door, hand-in-hand with Abbie. “Mom,” you call out, “we’re back home. I decided to skip school today, because I want to talk with you and Abbie about something important.”

Your mother comes into the living room with a concerned expression on her face, but when she sees you, she can’t keep from smiling. “Hello again. I guess you didn’t get all the way to school.” She chuckles as she comes over to you. You put an arm around her and hug her against you, your other hand still holding Abbie’s. “What did you want to talk about, honey?” she asks looking into your eyes.

“Mom, I told Abbie that we’ve discovered that we have, well, romantic feelings for each other” You smile and pull Abbie into a hug on your other side. “It turns out that Abbie has similar feelings.”

Your mother’s hand strokes up and down your chest and she leans her face into your shoulder. “I can understand why. It would be hard for any woman not to,” she purrs. She smiles warmly at her daughter.

Abbie nods in answer. “I think I must have just been denying it to myself forever. I can’t hide how I feel anymore.”

You tighten your arms around both of them. “I think, since we all have these feelings, and we’re all consenting adults, there’s no good reason we shouldn’t do something about it. It doesn’t matter what the outside world thinks. Inside the walls of this house, we’re the only ones who’s opinions matter.” You say that last part with conviction.

“Abbie, I told you that Mom and I have kissed, and that we’ve been thinking about doing more than that. I should tell you the whole truth. We have done more. I’ve titfucked mom, and fingered her pussy while she sucked my cock.”

Both women’s faces flush. Their breath comes faster, and they cling to you a bit tighter. Abbie groans, “Dave, that’s so hot. I bet it felt so good for you. Mom has amazing tits. I want to do all those things with you, and more.”

You slide your hand down to Abbie’s ass and give her buttock a firm squeeze. She gasps.

“We’ll do much more. All of us,” you tell them both. “Obviously, there are going to be some adjustments as we get used to the new way things will work around here. If either of you feel like you want something to change, or need something different, I want you to let me know. Never be afraid of telling me the absolute truth of what you are feeling, no matter what it is. And if this ever becomes uncomfortable for either of you, and you want to stop this arrangement, all you have to do is tell me. I’ll have no hard feelings, and still love you as my mom or sister forever. Do you understand?” You add that because it sounds like the sort of thing you should say, but because of the magic, you know it will never happen. Both your mom and Abbie nod their heads, as they look at you lovingly. Neither has anything to say, they both seem to be waiting on you.

You pull your mother into a deep kiss. She moans and shivers as your tongue slides into her mouth. Then you turn to your sister and kiss her. Abbie grinds against you and her hand slides to the crotch of your jeans, stroking up and down over your stiff shaft through the fabric.

You know you can do anything you want with them. The feeling of power is intoxicating.