I collapsed back in the armchair, sweaty and breathing hard.
My sister started gagging again and held her hands out in front of her, then coughed up half the cum I’d just unloaded in her throat. It spilled through her lips and into her hands as she tried to catch her breath.
"You’ve disappointed me," I said, shaking my head at her. "I thought you were a good whore."
"I am!" she wheezed, "I am!"
"Good whores don’t gag their dinner back up." I grabbed the back of her head and pushed her face down into her hands. She licked it from her palms, and I smeared her cummy fingers over her face.
"Swallow," I said.
She gulped loudly and opened her mouth. “See? I’m a good whore. I promise. I promise, baby. I promise.” She leaned down and kissed my cock.
"I know you are. You took it all. You kept your promise."
She smiled nervously up at me. “Do I get my reward now? Are you gonna pound my ass like a good whore?”