This is quite interesting! I like how the premise was quite intriguing especially with the mystery of Fletch, why he seems so attached to MC, his condition, and why/how exactly fits into this mysterious equation. I feel like this is some interesting part-worldbuilding with a besotted "groom".
I myself am just curious on what the dynamic is with Fletch and MC after they're "married", and just who exactly Fletch is, great little test run!