Three's company at Leah's

Riley walks over to Leah, who stands up, peeling off her dress and giving Riley a big kiss, squeezing her ass, and spreading open her cheeks so you can see Riley's cute little knothole.
"Riley, you're such a grown up now..." Leah says with pride. "So sexy..."
"I... never knew you liked girls, too..." Riley says, breathless.
"Oh I don't, really. But you look so tasty. And it was so hot and naughty, watching you suck your own dad's cock. I never thought you'd actually go through with it." Leah looks over her shoulder at you. "Though, I'll be honest, once she did, you had no chance, Mr. Sinclair."
"I think you can call me James, now, Leah."
The two girls climb onto the bed, and Leah reaches your cock first, taking it in her hand while Riley nurses a pouting expression. You crook a finger for her to climb up nearer to your face, and she does. You stick a finger into her mouth, and she greedily suckles on it while Leah begins to pick up where Riley left off.
You're in a state of illicit bliss for a while, with Leah slurping up and down your shaft, and Riley coquettishly sucking on your finger, mimicking Leah's motions.
"Mmm... very nice, Leah. Riley, you should watch. Pick up some....mmm.... tips..."
Riley's eyes flare, but then she smiles, pulling your finger from her mouth.
"That's a good idea, daddy." She looks down at Leah, and begins to stroke her hair, then she leans down to suck on your balls while Leah continues to work.
Your head is swimming with dopamine and endorphins. This taboo behavior is strangely intoxicating, and the presence of a third party, participating and approving, only strengthens the enjoyment.
After a few minutes, you sit up, motioning for Leah to lay in your spot.
"I think Leah deserves a reward for being such an understanding friend and hostess, don't you, baby?" You indicate Leah's pussy, exposed and moist between her spread legs.
"...yes daddy..." Riley growls. She's still into this, but you think maybe she's starting to regret this whole endeavor.
Riley dives right in, licking and fingering Leah, who begins to moan and squirm.
"Oh, sweetie... that's so good... where did you learn that?"
"My roommate in college showed me how to do it." Riley laughs. "She was a dyke and one night, I was drunk and wanted to know what it tasted like."
"Riley!" you say as you position yourself behind her.
"What, daddy?" Riley says without looking back. "Afraid your little girl's going to go play for the....OOOOOOHHHH!!!!" She cuts off with a moan as you bury yourself hilt deep in her cunt. "FUUUCKKK..." she buries her face in Leah's snatch, moaning and licking as you pound away.
"I don't care what team you want to play for, Riley, but right now, you play for the "daddy's cock" team." You realize it makes no sense when you say it, but you don't care.
After you pound away for a few minutes, Leah starts to buck her hips against Riley's ministrations. "Oh shit...I'm going to lose it!" She arches her back, spouting gibberish. "Ahnnonommmmmmmaaaammm....a......." her legs wrap around Riley's head, and you pound harder.
"Fuck...." she finally relaxes. "Let's trade places, Ry. I need to return the favor, and I think James wants to feel my cunt... right. James?" She winks.
"Yeah, I'd love to."
They quickly trade places, and soon, you're plunging your dick in Leah, and Riley's the one moaning under the attentions of a female tongue, though she never stops her smoldering gaze at you. This is not her ideal. She wishes it was just you and her.