This is another of those rather weird tags, depending on the application. Usually this tag would fall under the Transformation category, but I consider this here more to be just the surgical/scientific version of altering one’s body. So especially when there’s a surgery done, to somehow change something. Be that something to allow for a longer stay in some kind of fetish garment, or just general plastic surgery; something like Side Vocation by SickMind. Transformation is more about the magic version or also something in the direction of Absorption.
Human Sacrifice Seminar by Sumomo-EX
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