Tfgames.site has a lot of games like that (browse the "submission" tag), though mostly in the "feminization/sissy" variety.
If that's cool with you:
Mother/son+teacher/student sissy story line. Behave well for sexy rewards and voluntary TF's, behave badly for forced TF's and sexy punishments
boss/employee sissy story. very unfinished but has promise
>Hard times in hornstown
huge sandbox; feminization optional; VERY shallow character development.
Not much in the way of a story, but you're placed in a virtual reality which conspires to feminize/bimbotize you in a sort of game show where you're promised great wealth if you do well. A lot of content, a lot of focus on the psychological aspect of forced feminization, though lacking in a well defined master/mistress (f95zone will have the latest alpha content unlock).