I just found two new stories with transfer theme on Brawna. Hope you enjoy them.
http://brawna.org/stories/saintly-perfect-goddess
http://brawna.org/stories/sophya-and-niky
And just in case you haven't seen the transfer theme stories on Brawna (mostly muscle from man to woman), here is a link to the tag of it.
http://brawna.org/category/transformation/transfer
Max