Of course you would, but Abbie should go take her final first.

“I can’t imagine any guy not wanting to see two beautiful, sexy women pleasing each other,” you tell your mother. “But would you be comfortable doing that? I know Abbie has shared a man with one of her friends, so it might not be as big a deal for her.”

“Abigail Harris, you little slut,” your mom giggles. Then she sighs. “Don’t worry about me kids. When was Abbie’s age, I had shared a man with other women, shared women with a man, and I was already knocked up. **** will be a new thing for me, but it’s not like I’ll be corrupting you two into it. I assume you’ve already crossed that line. Will you be OK with sapphic love, Abbie?”

Your sister’s eyebrows go up. She looks as surprised as you feel. You’ve always seen your mom as very proper and restrained. She only went out on dates a few times that you can remember in your whole life.

Abbie bites her lip. “I’ve made out with a girl plenty of times, and considered doing more once in a while. It’s kinda weird thinking about doing it with you, Mom, but if it turns Dave on, well… I’d do anything he wants me to in a heartbeat.”

Your mother grins at you, then gets up from your lap. She rests her hands on Abbie’s hips and pulls her daughter close. “Come give your Mommy a kiss, Sweetheart,” she says to Abbie and kisses her hard. Your mom gropes Abbie’s tit as they kiss. Abbie whimpers and grips tight to her mother for support as her knees weaken.

You watch stunned, your cock throbbing as you watch your mother and sister kissing each other hungrily. “Fuuuck…” you groan. “If you two don’t take a break right now, I won’t be willing to let Abbie leave to take her final. In fact, I might not let either of you leave the house ever again.” You laugh half-heartedly at the joke, as you realize you could do it, and the idea appeals to a deep, dark part of your mind.

Your mother turns and looks at you, “Ooh, keeping your mother and sister as your fucktoy prisoners. That sounds sexy,” she coos. “I never even dreamed about that.”

“Abbie, go.” you make yourself say. “Take your final. Do your best on it. We’ll have all the time in the world when you get home.” You slide your hand around the back of your sister’s neck and pull her into a long, deep kiss. After you break off the kiss, you swat her ass to send her on her way.

Abbie scowls at you. “So now you suddenly get practical and care about education? Spoilsport,” she grouses and then sticks her tongue out at you. She heads to the door saying. “Keep Beanpole happy while I’m gone, Mom. But try not to wear him out completely before I get back.”

“No promises, Sweetheart,” your mother says sweetly to Abbie before the door closes. Once it does, she turns back to you. She opens her robe, then lets it slide off her shoulders and drop to the floor. She settles back into your lap, and wraps her arms around your neck. “How do you want me first?” she asks.