That night while most the family slept.

Lisa waited in the tree house naked gently fingering herself. Moaning with pleasure and the thought of what was to come.
Soon a head popped up the ladder, it was Millhouse. “So, Millhouse did you bring some money?”
“Yeah Lisa. Now how much do you cost?
“Ten bucks for a suck twenty for a fuck fifty for anything you want.” By this stage Millhouse was inside and stripping off his small cock hard but hardly satisfying.
“Alright I only have ten on me so…”
Lisa took the money and lent forward slowly swallowing Millhouse’s cock. But before she could even start to enjoy herself he came a pathetic little dribble.