Deep inside...

"Oh, daddy... you made me feel so good..."
"James, Riley...call... me....JAMES!" You punctuate each word with a thrust. Your own climax is building, but if she slips back into calling you daddy, you're afraid you'll lose it.
"Sorry, d.....James." She's staring wild-eyed at you, her face fixed in pure ecstasy. She smiles. "Your so strong and sexy, baby." She lays flat, arms back. "Everything I wanted and mooooore.....mmmmm....."
You pick up your pace, really drilling deep, and Riley locks her legs around you, pulling you down on to her chest to kiss your cheeks and face and press your head into her tits, while you pop a nipple into your mouth.
"Mmmm....." she moans as you bite gently on her nipple and pound roughly on her cunt. It's building now.
"I'm going to cum, Riley..." you whisper in her ear.
"Give it to me, James. Give me your cum." she whispers back, and the dam bursts. You thrust, emptying your balls inside your angel. "So...full....."
"NNNGGGG!!!" You collapse, and with your lust subsiding, the full weight of guilt slams home. You roll off to the side, with an arm draped across your eyes. Are you such a **** to your own lust that you've sacrificed your whole sense of what's right and wrong?
"Oh my God...Daddy... thank you so much." She lays her head on your heaving chest. "That was everything I wanted."
"I'm glad..." you say flatly.
"Oh, daddy please don't be upset. You didn't take advantage of me. This was a dream come true for me. I never thought I would ever actually get to have this." She circles a nipple with her finger. "It was the best birthday present I could have hoped for."
"We can't do this again, baby. You understand that right?" You look at her face, and see disappointment, but then acceptance.
"I know. I don't want Momma to find out any more than you do." She slides up to plant a kiss on your lips. "I love you, Daddy. Thank you so much."
You hold her for a while, sorting through your complicated feelings, before you both decide to shower and get on with your days. Riley has to pick up Alli, and you have to get home before your absence is noted. In the shower, you indulge in a little bit of romantic kissing and embracing, but after its done, you return to a more playful, father-daughter dynamic. You hope it's that easy, though you don't have a lot of faith that it will be.

The clock reads 2:10 as you pull into your driveway.