She was allowed to wear panties, but only panties, so her roommates could have something to tear to shreds before decimating her tight holes with their wonderful cocks.
They promised to pound every one of her holes every day, if she obeyed them without question. She could enjoy being treated like a piece of meat made to pleasure men and they could enjoy the tightness of her ass, the heat of her mouth, the soft spring of her breasts, and the wet heat of her cunt.
She gave herself to them and in return they gave her purpose, to please her wonderful roommates, to serve their cocks, and to beg for them to cum.