I knew I wasn't going to last much longer. I moved with more urgency, bouncing my cock against her throat on each thrust and making her gag. I thought she might pull away because it was getting too rough, but she didn't. If anything, she was attacking my cock more aggressively. Then it happened. I thrust up between her lips and grunted. Hot cum sprayed like firehose directly into my sister's mouth.

Kathy was caught by surprise. She coughed as it shot against her throat. Cum poured over her lips and oozed out of her nose. My cock fell out and splattered her face. Kathy got her lips back around...