She arched her ass back a little, and felt the returning pressure. A soft sigh came from her mouth as the cock throbbed more and more. She lifted up and down on her tiptoes, sliding the crack of her ass on the man's hard-on. In her mind, Tommy's cock was sliding up and down, and she could practically feel the hard flesh of his cock against the nakedness of her flesh. She imagined she was naked, with Tommy's cock sliding up and down the crack of her smooth, rounded ass. Her cunt throbbed and burned, her cunt pressing at the crotch of her wet panties.

The man pressing up against her ass was jiggling up and down, dry-fucking the crack of her ass. He was encouraged by the sharp backward press of her ass and the way Susan squeezed her asscheeks together. She wondered if it would be possible to get fucked on a crowded subway car, with no one knowing the difference. Crushed so lightly, she felt it was possible. Neither would have to really move, she decided. The sway and jolting of the train would do the work for them.

The gasping behind her was increasing, and Susan wiggled her ass as best she could. It amused her to think she could make this man, this person behind her, come in his pants. He would be satisfied, and although she wouldn't, it would feel good to cause his cock to gush into his pants. It wasn't really a cock tease this way, because the man would get something out of it. And it wasn't as if she was being fucked.

Her station was coming up, and she felt she had to hurry if she wanted to accomplish this. She pushed her ass backward as hard as she could, and felt the return pressure of that throbbing hard-on. Her panties and skirt were right in the crack of her asshole now, and she could actually feel the unknown cock throbbing against her assbud.

Then it happened. The man gave a strangling gurgle, and Susan felt the spasms of his cock between the cheeks of her ass. She hoped he didn't come so much it seeped through his pants and got her skirt wet.