VN Ren'Py Slave U

Slave U follows a young man in a fantasy matriarchy where only women can use magic. Men are second-class citizens. He has an estranged relationship with his mother and has just arrived at a new school. Whether he forges a stable life or falls into despair is up to the player.

The 3DCG renders, big-tits character design, bukkake scenes, creampie content, female domination, footjob, futa/trans, group sex, humiliation arcs, internal-view scenes, interracial moments and sissification routes all factor in.

At v0.42 the game has substantial content with a clear matriarchy worldbuilding. If you want a fantasy feminization game with a real magical-matriarchy setting, school structure, a male protagonist navigating his second-class status one chapter at a time, and a kink stack that ranges from femdom to full sissy submission, Slave U delivers.