Just the flat-chested one

Michael felt slightly bad for the flat-chested girl. He didn't think she'd cry.

"Say, what's your name?"

"Um, Madison."

"Madison, believe me when I say that you will be me and my girlfriend's personal maid during the week, and then on the weekends, these three will use you. Believe me when I say that this arrangement is all right with you."

Madison sniffled. "Yeah, that's okay."

The boys and the other girl go back to relaxing in the pool, and Michael takes the new maid Madison back to the house.