From a Strange Tingle by Shmabahamoha

This lovely fetish story by Shmabahamoha follows Damien as he meets Fiona, who tells him about their shared magic, which both of them could feel through a kind of tingle. It turns out that with this magic, the two could somewhat change themselves, as well as the other, especially related to clothing. The two quickly fall in love and Fiona’s submissive side comes out quite rapidly, which only gets amplified, as Damien uses their powers to lock different garments onto Fiona, making it impossible for her to remove by herself. As the two have their first night together, it turns out that the strong shared desires cause Fiona to be changed more than initially seemed possible, as she wakes up with a slightly modified body, as well as permanent piercings.
From there on, the two live out their kinky master-pet relationship, continuing the change for Fiona over time…

<