Leave you to it...

"No...no no no..." she laughs. "I feel bad for interrupting."
"Feel...? but this is your house...and what we're doing isn't exactly...right..." you stutter.
"It's not my concern if you two want to explore a little taboo. You aren't going to put a baby in her, are you?"
"God, no! And be a father and grandfather at the same time? Do you see a banjo anywhere?" You are appalled at the idea, though you aren't sure how it's that much worse.
"If I were Riley...I'd probably try to fuck you, too, Mr. Sinclair." Leah looks you up and down.
"Hey..." Riley puts on a pout.
"What? It's true. He's a fox. And not even a silver fox, yet."
"Leah likes older guys..." Riley explains.
"I do, but I won't rain on your parade. I'll... go to a coffee shop or something... kill an hour. Will that be enough privacy?"
"Definitely. You're sure you don't mind?" Riley sits on the bed. "We can do it on the couch or somthing instead of-"
"Oh you've already defiled my bed, you might as well keep going..." she sticks her tongue out. "I'll see you two in a hour?"

After Leah leaves, Riley turns to you. "Did... did that kill the mood, daddy? I don't know how I feel now. Somebody knows what we're do-mmph!!" She cuts off when you grab her hair and pop your cock in her mouth.
"Stop wasting time, Riley."
You spend about twenty-five minutes fucking your little angel's brains out. You pull out all the stops, tapping into your animal nature. Eventually, you find yourself fucking Riley doggystyle, slapping her ass cheeks and tugging her hair for leverage as she whines and moans, until you can't hold back anymore, and paint her insides.
"Fuuuuuuuuuuuuuu..........................." you bellow, and Riley screams, "Oh, Daaaaaadddddyyyyyyyyyy!!!!" before collapsing into a quivering puddle.
You spend another ten minutes of tender affection, kissing and stroking her hair, all the while realizing how deeply in shit you are. You have zero confidence in your ability to not plunder your daughter's treasures again....and again.... as long as they are available.

You clean up, leaving first. It's almost 2:15. Jenna's probably home by now, thought you have no texts or missed calls. You head home, shaking your head and trying your best to rationalize your animalistic behavior.