It was late when she got in, his ex-girlfriend up to stay at a cabin they were renting among a group of mutual friends. The room had two beds -- just about everyone had gotten to the house early, and the other rooms were basically all taken.
He pretended to be asleep -- she turned the light on for a second and must have been able to see it was him. She rolled her bag in, unpacked her toothbrush, and left the room.
He closed his eyes again and didn't open them when she returned. He heard her take her pants off and what must have been her sweater. She got under the covers.
They had broken up years ago. She had probably gotten over it more quickly than him. There'd been some fooling around in the early days but never cheating and nothing recent. She was dating a professor of something he didn't want to think about; it seemed permanent. By now they had settled in to a casual but stilted friendship -- they would always be exes more than friends.
Minutes passed -- he found it hard to relax. Images of her going down on him-- in the hot tub, in the snow -- went through his mind.
He heard her turn over, facing the ceiling maybe. She gave a sort of harrumph, unsatisfied, clearly wide awake herself despite the hour. He wondered if he should say something. He turned over his pillow to its cool side, somewhat noisily. He tried to think of boring thoughts so he could fall asleep.
She moved about. He heard her breath quicken a bit, thought he heard a murmur, some rustling, not quite a moan, then nothing, as if she were coming to a decision.
He'd opened his eyes by now but he couldn't see much in the dark. She turned again, her breathing changed, became deeper as if she were trying to calm herself. She sat up in the bed (though he couldn't quite see), paused, swung her legs around and in a second she'd crossed the space between the two beds and she was on him and under the covers.
He was on his side, but she clearly wanted to be on top and forced him onto his back. There was a pause where they were both breathing hard. It was clear that he wanted this, making small thrusts up at her. He felt her naked legs against his as she ground against him. His hands crept to the side of her hips, under her t-shirt. He moved to kiss her but she pushed him back, bringing her chest to his face. He pulled her shirt over her head and brought his tongue to her breasts, her nipples beginning to get hard -- sucking on them now and kissing along her ample cleavage.