push your cock into her pussy

You slide your cock up and down Kristen's wet slit a few times and then push your erection against her. You slide easily into her cunt and begin to fuck her. You push your cock as deep as you can into her – intent on claiming Kristen as your own.

"Oh god," she moans in between thrusts. "You're so big...."

You keep fucking her, seeking satisfaction. You realize Kristen's boyfriend must not be as well hung you, and the thought that she's already mentally compared the feeling of your cock in her cunt to her boyfriend's actually makes you harder. The excitement of fucking Kristen is starting to overpower your control. You realize you are about to cum, but you are not wearing a condom and you have no idea whether she is on birth control. Still, the idea of filling her pussy with your sperm and leaving her cum-filled cunt for her boyfriend to find later has a certain appeal.