Shared panties

Ive often thought about what it woiuld be like to have a relationship with a girl who would make me meet her at the end of each day and be required to have clean panties for her ready, but to be given her day old, worn panties to wear myself until the following night. So im kept in her worn panties only but that would also make me responsible for laundry or purchasing all of her new panties. This could also work for things such as bath water or other things. Anyone have any thoughts or experience about this?