Tell him you don't want to get pregnant

"I c-" you start, moments from orgasm. "I can't get pregnant!" Is all you can muster before it hits you -- wave after wave of pleasure taking you, your legs giving out beneath you. You're only staying upright because the man behind you is holding onto your hips to fuck you.

"Unh!" he grunts, pushing himself into you until he was balls deep inside and held himself there.

In your bliss, you hardly registered the tickling sensation deep inside of your vagina. It was a forcible throbbing, out of sync with your own subsiding tremors.

Your eyes went wide with shock. "You didn't," was all you could manage. He obviously didn't hear you. The throbbing continued for what seemed like ages. Finally, the man stepped back with an audible, wet 'pop'. You expected cum to start running out from your abused pussy, but nothing came out.

Was it your imagination? Did he not cum inside of you just then? Was he shooting blanks? Was that even how that worked?

"Get your clothes on and get out of here before I change my mind and decide to charge you with theft," he said, flopping back onto the chair he'd been on earlier. He started mopping sweat from his head with a towel that had been sitting on top of a filing cabinet.