You have them line up

"Okay girls, line up!" you shout, as your brain starts to formulate a plan.

They obey, and line up in the order they blew you.

"Now, girls, your slavery begins today. However, as my nuts are pretty much empty for now, there's not much I can do for the time being. There is stuff you can do though!" You say.

"What sort of stuff?" asks one of the girls.

"Oh... you'll see." You say, grinning.