Fusion Of Destiny: Merged Desires (NSFW Ver.) (Patreon)

Synopsis:

After returning to Chaldea from a successful mission, the Master and Jeanne d'Arc find themselves growing closer, much to the concern of Mash Kyrielight. Feeling left out and desperate for the Master's attention, Mash resorts to using a recovered Holy Grail to wish for a way to become more like Jeanne. The result is a dramatic transformation that blurs the lines between the two women. As Mash's newfound appearance leads to possessive actions, the Master faces a complex and emotional dilemma.