I wish i was a thong

My greatest fantasy is to be turned permently into a womans or a young girls underwear. Its not so much a sex thing it's more the feeling of being powerless between some ones legs.
I fantisize about being a pair of knickers. I try to imagine what it would be like. Or a G string. Always my face stuck under the woman or young girls bottom.
I try to imagine her farting on me, and the smell of her dirty bum. I pretend to hear the sounds of the outside world as she walks around a shopping centrer or runs up the road, or where ever.
I imagine that every day I wake up between a different girls legs. either as a sexy thong or just as a simple pair of panties.