Railing -
Hero Party Must Fall (Ren'Py) - You play as a secret spy sent by the Demon King to corrupt and destroy the Hero's party. (NTR optional femboy contents.)
Playing as -
Paradise Succubus (RPGM) - You play as a Hero. There are three routes. The second is feminization I think. The first is deflowering and the third is MtF transformation. You need to unlock them one after another.
Bonds Defiled (HTML) - Adventurer, Magic world, NTR
If you have good imagination, text MtF transformation or sissification games like the classic Perverted Education(HTML), The Company(HTML) and Secretary(HTML), especially Secretary.
In development games like A Prince's Tale (HTML), The Princess Trap (HTML)
Sandbox text games like Lilith's Throne (Java) - go underground, Degrees of Lewdity (HTML). You should go for the femboy build. Lilith's Throne has furry content you can disable.
There are a whole lots more text games, but these I mentioned are probably the better ones.
