Dan lounged on the couch, nursing a beer, when Chloe sauntered in with that wicked glint in her eye. "Truth or dare, step-bro? Or are you too chicken for a real game?" Her voice dripped with challenge, hips swaying as she claimed the armchair opposite.
"Dare," Dan shot back, smirking. "Bring it, sis. Your rules are always half-baked."
Chloe leaned forward, cleavage straining against her tight tank top. "Fine. I dare you to motorboat these tits for a full minute without getting hard. Fail, and you shrink an inch. Magic's on my side tonight—don't ask how."
"Motorboat? That's your big play?" Dan laughed, but his eyes lingered. "You're on."
He dove in, face buried between her warm breasts, but the scent and softness got to him fast. His cock twitched hard against his jeans. Chloe pulled back laughing. "Time's up, and look at that bulge. Shrinking starts now."
Dan felt a strange tingle; suddenly an inch shorter, clothes looser. "What the hell?"
"Your turn," she purred, standing tall. "Truth or dare?"
"Dare," he growled, horny despite himself.
"Lick my nipples through this top till I moan. Fail, shrink two more inches."
Dan tried, tongue flicking, but Chloe stayed cool, witty as ever. "Pathetic effort, little man. Two inches gone." He shrank again, now eye-level with her chest.
The game escalated—dares with her tits, each failure shrinking him further until he was knee-high, tasks height-related like climbing her curves. Sweat beaded on Chloe's skin as tension built. "You're panting already, Dan. Horny much?"
"Screw it," Dan rasped, voice thick. "I dare you to fuck me right here."
Chloe grinned, strong and unyielding. She stripped, revealing her dripping pussy. "Only if you can handle this ass." She mounted him, his hard cock sliding into her wet heat. They moved frantically, her riding with power, him gripping her ass. "Your cock feels bigger down there," she teased between pants.
Dan came hard inside her, cum mixing as she climaxed, sweating and moaning. "Not bad for a shrinking perv," Chloe whispered, still dominant. The explosive heat left them both breathless, hinting at more shrinks ahead.
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