Weeks blurred into a haze of Sundays. Claire’s routine solidified: wake early, kiss Mark and Luca goodbye, clip into her pedals at the Scotts Valley parking lot with the group. The rides were grueling — 70 — 90 miles through the Santa Cruz Mountains, legs screaming on the climbs, fog thick in the redwoods, coast views rewarding the descents. Theo was always there, lean and fast, his easy smile hiding the heat in his glances. They’d match cadence effortlessly, hands brushing when passing gels or bottles, the group ribbing them as “ride partners” without suspicion.

When the pack finished — tires crunching to a halt, helmets unclipped — most riders loaded bikes and drove off. Claire lingered, pretending to fiddle with her Strava app or adjust her saddle. Theo would roll by, murmur “See you soon,” and pedal toward home. She’d follow at a distance, pulse hammering against her ribs, until they reached his small house near the beach. There, the door clicked shut; no preamble. He backed her against the kitchen counter, unzipped her jersey, pushed her sports bra up to free her full breasts. Nipples hardened instantly in the cool air. Theo groaned, palmed them roughly. “Been thinking about these since the ride started.”

Claire tugged his jersey off, hands roaming his lean chest, then dropped his bib shorts. His cock sprang free — thick, already leaking. She stroked him slow, eyes locked on his. “I want to feel you come,” she whispered, voice husky. “Not inside this time. On me. On my tits.” A flicker of something dark crossed her mind — Mark had asked once, years ago, voice tentative; she’d laughed it off, said no, too messy, too much. She’d never let him. But with Theo, the words came easy.

Theo’s breath hitched, eyes darkening. “Fuck ... you sure?” She nodded, sinking to her knees on the tile, sports bra still rucked up, breasts heavy and exposed. She took him in her mouth — slow at first, tongue swirling the head, tasting salt and pre-cum — then deeper, hollowing her cheeks. Theo groaned, hand gentle in her ponytail. “God, Claire ... your mouth ... gonna paint those pretty tits.”

She pulled off with a wet pop, stroking him fast with both hands, aiming the swollen head at her chest. “Do it. Come all over me.” Theo’s hips jerked; he came hard — thick ropes of cum spurting across her breasts, warm and sticky, streaking from one nipple to the other, dripping down the curves. Claire moaned softly at the sight and feel, rubbing the head against her skin to milk the last drops. “Yes ... just like that.”

They stayed frozen a moment — her tits glistening with his release, his cock softening in her hand. Theo grabbed a paper towel, wiped her gently, then kissed her deep. “You’re fucking dangerous,” he murmured. She smiled, pulled her bra and jersey back down (the faint wet spots hidden under fabric), and rode home with the secret thrill still tingling across her skin, his cum drying under her kit.

Every pedal stroke rubbed the damp chamois against her swollen clit, sending fresh sparks up her spine. She told herself it was just sex — just after the ride — but the thought of doing it again next Sunday already made her thighs clench around the top tube. For the first time she wondered if she was becoming someone Mark would never recognize.

From then on, she mostly insisted on creampies — wanting to feel him fill her, carry him home — but that first explosive finish on her tits lingered in her fantasies, a reminder of how far she’d already fallen.

Claire swore each time was the last. But the pull was too strong. She started choosing tighter kit — higher-cut shorts that hugged her ass, jerseys that clung when damp — telling herself it was for performance. Theo noticed, texted mid-week: “Those shorts Sunday? Fuck, Claire. Can’t stop thinking about peeling them off you.” She’d delete the messages but replay them later, fingers dipping between her legs in the shower, coming to the memory of his thick cock stretching her.

Mark was a constant, steady presence — almost too steady. “Take your time out there, babe,” he’d say, waving her off. “I’ve got Luca. Sarah’s coming over with her kid for a play date anyway.” Claire noticed the occasional glow of his phone at night, a quick smile as he typed, a faint floral perfume on his shirt after one “quick drop-off.” She felt a flicker — Weird — then pushed it down. He’s just being helpful with the kids. I’m the guilty one. It eased her conscience a bit, let her rationalize another Sunday detour to Theo’s.