In this adult sibling role-play, the parents are often away because they both work, giving the brother ample time to train his two adult sisters to obey his every sexual command. No matter the time or place, one call has them immediately sucking his cock, and now he can have sex with them whenever he wants. His excessive training has made them insatiably horny, but that only makes them even more useful as personal sex toys, eagerly swallowing his cum and taking repeated creampies.