Step-Sister's Midnight Mirror Masturbation

The house was silent except for the low hum of the air conditioner fighting the thick summer night. Alex lay in his room, wide awake, when he heard the soft creak of Kayla’s door down the hall. His pulse jumped. He knew that sound by now. It was the third time this week.

He waited ten heartbeats, then slipped out of bed wearing only loose gray boxers. The hallway floorboards were cool under his bare feet as he padded toward the shared bathroom at the end of the upstairs landing. The door had been left cracked open just enough for a slice of warm light to cut across the dark carpet. He moved like a shadow and peered inside.

Kayla stood in front of the huge mirror above the double sinks, her back to the door. The oversized college t-shirt she’d worn to bed was already on the floor. She was completely naked. Twenty-one, home from her junior year, and shaped like every filthy fantasy he’d tried not to have about his stepsister. Full, heavy tits with dark pink nipples already tight. A smooth, shaved pussy that glistened even from where he stood. Long dark hair spilled down her back, still messy from sleep.

She cupped her breasts in both hands, lifting them, squeezing, thumbs brushing the stiff peaks. Her lips moved. He strained to hear.

“Look at these fucking tits,” she whispered to her reflection, voice low and dripping with heat. “So big and soft… you love showing them off, don’t you, you dirty little slut?”

Alex’s cock surged instantly, thickening against the front of his boxers. He bit the inside of his cheek to stay quiet. Kayla’s hands slid lower, palms gliding over her flat stomach until her fingers reached the smooth mound of her cunt. She spread her feet wider on the tile, thighs parting. Two fingers dragged slowly up her slit, parting puffy lips that were already slick and shining.

“Mmm… so fucking wet already,” she breathed, eyes locked on her own reflection. “Just thinking about being watched makes this greedy pussy drip.”

Alex’s hand moved without permission, palming the thick length of his cock through the thin fabric. He fought the urge to pull it out right there in the hallway. The tension was unbearable. Every soft, wet sound her fingers made against her folds echoed in the tiled room. She dipped one finger inside herself, then two, pumping slowly while her other hand rolled a nipple between thumb and forefinger.

“Fuck… I need it deeper,” she told the mirror, voice growing huskier. “Want to be seen like this… want someone to watch me ruin this tight little hole.”