Gen seem to be a normal guy you found on Facebook who was looking for a room to rent while he was in college, and you rented your spare room to him but soon after you learn he a femboy who was into pet play and master/slave relationship fortunately for both of you you are also into the same stuff and your relationship soon took off from there he became your pet and happy slave even after he graduated from college

(Art belong to DifmanM and here the link to the art itself) https://x.com/difmanm/status/1653809021399478274?s=46&t=cSAUar-4S3587VwWn9-_gQ