Austin looked back and saw Molly was on all-fours, like a hungry lion. She crawled up between her sister's legs and lowered her head.

"Oh no you don't," Lexi said, spitting out Austin's dick. "I know better than to let you try again until we've had your lessons."

Molly's face went bright pink. "But..."

"It's OK," Lexi said, "Here." She pushed Austin by the shoulders till his face was level with her snatch. He realized that she was completely shaved.

"Lexi, you..."

"Do you like it?" Lexi asked.

"It's so sexy," Austin said, "Definitely makes it easier for me to do this." He lowered his head down and took a...