The night was unbearably still. At just 24 they were still not accustomed to sharing a bed. He let his hand brush against her arm wondering if she was awake. Half-afraid she'd be bugged and roll over, he was surprised when she moved her arm—almost imperceptibly—but didn't turn. He got bold and let his hand fall down to hers to see if he could get her fingers to play with his. At first they didn't and he was starting to wrap his head around falling asleep. Then her ring finger ever so gently seemed to caress his, just enough to stir something in him. He felt his short boxer-briefs get shorter as he grew to half-mass.
She felt his hand, with achingly slow caution, cross her stomach breaching the elastic band of her black cotton thong a few times but never more than an half an inch. He played with one of the tiny pink bows on the corner of it. Slices of light from the window showed her young breasts and he could see the little bumps on her aureolas. She was overwhelmingly beautiful.
He began to trace the hem down to the inside of her thigh. Convinced she was awake and encouraged by her slightly shifting and separating her legs , he followed the hem to the base of the triangle where it disappeared in between her butt cheeks. He stopped.
Soft little breaths hinted at her permission. He traced it a a few millimeters further and paused again. They sat silent for a few full seconds and then she shifted a little more begging him on. He extended his finger a little more, emboldened by the dark quiet room which seemed to have a set of rules of its own.
His middle finger, which she could feel had traced its way astonishingly low, hooked under the string of her thong. She felt the top of his knuckle brush an area she wasn't sure he'd touched before as he pulled firmly at the panties. Planting her heels in the mattress, she lifted her back allowing her undies to come off in a way she wasn't sure they'd come off before. She felt a freedom in the darkness. As long as nobody spoke this wasn't real—just a sort of shared fantasy. As if both their eyes were still closed and they were just thinking these things.
With nonverbal cues and strong hands he arranged her on all fours on the bed, presented for the dark room without a scrap of clothing to cover her. The thrill of the compromising position coursed through her and, made brave by the darkness, she reached her hand between her legs and began to masturbate unprompted. It wouldn't have been a particularly arousing or comfortable position alone in the broad light of her bedroom but there was something about being presented like that, stared at, her hind quarters illuminated only by wisps of moonlight coming through the blinds. Her whole body feel electric. She began to fervently rub. The sensation of getting herself off in front of someone in such an immodest way tingled.