As you feel up your mother, groping her breasts, you feel her shiver. She presses herself harder against you, inadvertently sliding your semi-erect shaft between her voluptuous cheeks, causing both of you to moan at the sensation. With a lustful gaze and a mischievous smile, she looks back at you, swaying side-to-side slowly.
"Well," Your mother starts, a teasing note in her voice. "I suppose we can stand to get a little dirtier."
With a predatory grin of your own, you slowly drag one hand down her wet chest, past her belly, along her crease. While her sighs grow breathy, you tease her mound, dragging your fingers through her carefully sculpted bush, but avoiding her dripping pussy. You start to grind your cock through her crack, neatly splitting her buns with every complete thrust. Growing harder and harder from her every whine, gasp, and moan, it doesn't take long before you're fully erect. But, while you're only getting started, she's still sensitive from the previous orgasm.
"Please," She gasps, one hand on your hip, the other on the hand still teasing her breast. "Please, just fuck me already!"
With a toothy smile, you insert two fingers roughly into her soaked snatch. She squeaks, clapping her thighs together and grabbing your wrist. As you caress her inner folds, she moans, her body trembling from the overstimulation. As you insert another finger into her greedy hole, you press your teeth against her throat, lightly biting her. Clearly, the feeling proves too much for your mother, as she cums, drenching your fingers in her nectar as her shrill squeal echoes through the small room. As a plan begins to hatch inside your mind, you bring you cum-soaked fingers to her mouth, and watch as she sucks on them, cleaning them throughly.
When her body begins to relax, you become more focused with your grinding. Once you find where the head of your cock catches the rim of her ass, you slowly bring your hips back, then, rocket forward, penetrating her unsuspecting anus. Your mother jerks with a shriek, as your thick length burrows deep into her desperately-clenching hole, her eyes crossing while her jaw goes slack, drool leaking past her lips. Her nails dig into your forearm as her bladder relents, leaking down her thighs and spraying onto the shower floor, creating a puddle that's swiftly washed away. You pound away at her asshole, her whorish moans muffled from your fingers in her mouth.
"You're so good to me, Mom." You gasp, pinching her nipple as your length bottoms out in her tight butt. "Milking my cock while I ruin your hole."
She moans, trembling from the force of your movements. She's become little more than the marionette to your puppeteer as she dances to your strings. As you feel your orgasm approach, you accelerate your thrusts, going faster and faster. The clapping of your hips to her cheeks loud in the shower with the accompanying sound of your balls slapping her leaking pussy. A few more rough thrusts and you fire another load deep into her ass, a shiver running down her spine at the feeling of your heavy load painting her insides. You both stay that way for awhile, panting and gasping as you come down from your sexual high. While the water temperature grows cooler, you take some soap and give your mother a brisk scrubbing, considering her still blissed-out expression as she occasionally clenches around your lengthy dick, as even in her dazed state, your mother continues to try and milk you dry.
Then, you repeat the process with yourself and rinse both of your bodies off under the nearly-cold spray of water. With slow movements, you pull your cum-covered cock out of your mother's ass, and watch as your seed runs down her legs, her gaped hole unable to close. Bringing her with you as you get out of the shower, you gently pat her tired body dry, wiping up the cum running down her thighs, and move to the master bedroom. You gently lay her down onto her belly, with her face towards the edge of the bed, and cover her with some blankets, after becoming temporarily mesmerized by the sight of her hole leaking your cum down onto her pussy while she drifts off to sleep. Then, you dry yourself off.