Jenna drops to her knees.

"Where did you get such a nice cock...?" she is stroking more slowly now, really admiring it with her fingers as you kiss her neck.
You resist, thankfully, the sudden impulse to say "from my father." Jenna has her eyes closed, her lips are parted, and she's letting out little moans of pleasure as you work your hands on her big, soapy tits, pinching the nipples softly. Jenna had breast-fed Riley, but when Jared came around, she had decided to pump more and use formula, so her nipples were beautiful and responsive, still. She had not, like some mothers, lost the erogenous zone of the tits, and for that, you were grateful.
Jenna's eyes open, and she pushes you back against the back wall of the shower. Looking up at you through her long lashes, she sinks slowly to her knees. She continues to jerk the base of your cock, and rub your balls with the other hand, and she begins to slurp and kiss and spit along the shaft.
You put your hands above your head and relax, as her lips wrap around the head of your dick. With a practice and familiarity with your cock, she begins to give you one of her expert blowjobs.
"Oh baby. You know just what to do..." you muse as she dives deeper and deeper with every bob of her head. Even after all this time, the sight of her head bobbing on your cock is exciting, and naughty, and so pleasurable. You think back to that first blowjob, in the storage yard of your dad's shop. You had gone out for ice cream after school, and on the walk home, you had snuck over the fence to make out. Well, making out was all you had been hoping for. It hadn't taken long before she had had your pants around your ankles and your dick wedged in her mouth. She had even swallowed when you were done. You think you had decided to marry her that day.

The pleasant memory is working its magic as your balls tighten. You stroke Jenna's hair, and announce, "I'm going to cum, baby." Her efforts redouble, and she starts bobbing double time on your prick, helped by a little pressure from your hand on her head.
"Ah...Ah....." you hit the edge, and your cum streams into her mouth. It isn't the most forceful cumshot of your life, or the largest, but it feels good enough. Jenna moans, tasting your warm, sweet and salty load. She pops free of the head, stroking the last spurt onto her tits. She knows that you like to see your work on those glorious orbs. And besides, clean up is easy.

"Thanks, baby. That was great." you pull her up to kiss her, not really caring if your cum is still in her mouth or not. If she can taste it, so can you. You never want her to think you take what she does for granted.
"It's a privilege to polish such a nice cock, James." She gives it one last tug and rests her head against your chest. "Now let's finish up. Lots to do today."
As you finish the shower, towel off and head upstairs, she turns to ask you, "Will you please call a plumber while I get ready to go to the store? I know it's a long shot to get someone out this weekend, but will you find out for me?" She smiles and bats her eyelashes. You're such a sucker.
"Of course baby. I'll do my best."
However, when you go into your office to retrieve your cellphone, you notice two missed calls from Kayla at work. You curse under your breath. Not today. You told her.

As if summoned, the phone rings again. Kayla, of course.