This plot will be very transformation-heavy, for those that like that. I can see it also going smut heavy or romance based, so we can brainstorm a little.
A bit literal...
A girl comes across an old oil lamp in a local antiques store that she simply has to take home. When she gets home, she finds it contains a genie, who grants her unlimited wishes! Unfortunately for her, the genie is one to take things very literally, which gets her in all sorts of trouble...
((Includes: Whatever sort of body and mind alterations you can think of (except futa or gender bender) Possible: Multiple girls end up coming over, granting the genie a harem to play with.))
A bit literal...
A girl comes across an old oil lamp in a local antiques store that she simply has to take home. When she gets home, she finds it contains a genie, who grants her unlimited wishes! Unfortunately for her, the genie is one to take things very literally, which gets her in all sorts of trouble...
((Includes: Whatever sort of body and mind alterations you can think of (except futa or gender bender) Possible: Multiple girls end up coming over, granting the genie a harem to play with.))