"I'll be a good girl."

Jenna gyrates her hips, but relaxes her legs and stops trying to **** you back inside her.
"I'm a good girl, baby...." she coos, laying flat and pillowing her head on her arms. "I'll be good, I promise. Please give me your big dick. Please?"
This is so hot, and the best part is, Jenna seems to be sinking right into the role.
You resume fucking that hot slit, and probing that tight rosebud with first one finger, then two. Her moans get more high pitched as you stretch both pussy and asshole, and you inch closer, your knees almost touching the backs of hers as you get deeper, and pound harder.
"Do you want my cum, my good girl?" Your voice drips with sex.
"Yes, baby! Please fill me...." you pull your fingers from her asshole, and grip those curvy hips with both hands as you begin to hammer your dick home into its sheath with gusto. Her voice kicks up another octave, and you can feel her pussy start to spasm.
"Oh, fffffff......I'm cumming, James..." her arms flail, seeking anything to grab on to as her body shudders with a wave of orgasm. You catch her arms, pulling them behind her back to leverage yourself even harder and deeper into her convulsing snatch.
"FUCK....take my load, Jenna. TAKE IT."
As you unload a stream of sticky hot spunk into your wife, a flicker of movement catches your eye. Reflected in the black screen of your sleeping laptop, you see that you and Jenna have an audience. Zoe is standing in the doorway, and she appears to be watching with rapt attention.
There's nothing for you to do but finish strong, and ignore her.

You sit back into your office chair, which rolls a foot away from your shaking and panting wife. You glance at the laptop screen, but the reflection shows that Zoe is no longer there. Jenna slowly straightens, then turns to lean against the desk. Her eyes are unfocused and her makeup is a little smeared, but the look on her face is the one of pure euphoria that comes after a real good orgasm.
"Holy Fuck, baby. That was...incredible. What's gotten into you?" she begins to gather her wits, looking for the shoes she kicked off.
"I'm about to be overwhelmed with a house full of people. I needed to fuck my wife good and proper while it's still convenient to do." You smile a wicked smile. "So you remember what your missing if we can't do it again for a while."
Her face breaks into a wicked smile of her own. "Oh, don't worry babe. I have no intention of letting our full house get between me and that dick. We'll just have to be...circumspect. It'll be like high school all over again."

She gathers her shoes and purse, and then suddenly realizes something. "Um....can I have my panties back, please?" You realize that your sitting on her panties, laying on the seat where you tossed them. You pull them out, but then have an idea.
"No." you grin. "They're my prize." You put them up to your face and take a big sniff. They smell like Jenna's pussy after a shower. "Go on. Get to the store.....naughty girl."
Her look of annoyance mixed with amusement and could it be...arousal is priceless.
Without a word, she slowly leaves the office, stopping at the door to look back at you, and then shake her head as if she can't quite believe who you are.

For a moment, you spare a thought for Zoe. She was shamelessly watching you, her big brother, and Jenna have a quickie. Zoe had always pushed the limits of what most people would consider proper, especially with you. When she was younger,she would ask you to show her your dick, so she could see what it looked like, without realizing how inappropriate that was.
Well, Jenna didn't see, and you're content to let it be if Zoe does. Besides, you admit to yourself. It was strangely....hot, knowing that she had been watching.

You spend the rest of the morning cleaning and tidying up, trying to return your headspace to normal. Tara helps, and then plops down on the couch to watch TV. When Jenna returns, you all help put away the groceries, and just as you finish that, twin car horns honk as they pull into your driveway.