ArmSpaghetti
There are already lots of futa/shemales games where each docking each other or one-sided docking, sometimes the smaller one dominates, sometimes the bigger one dominates. Here is
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What I find very rare is the pure female urethra insertion/female urethra fucking without anything else just like the futa version or the normal male urethra insertion.. with nothing barred. Often the female urethra insertion is rather.. very mild. While the male urethra insertion can go all the way and even crushing balls and penises (CBT). I am still waiting for a game where the male/female MC can go full mode to explore female urinary tracts as deep as possible (which is none until now and NOT FUTA/SHEMALEs) without any remorse or no mercy on the females.
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The other fetish game I will definitely sponsor is a total reverse femdom game where the male MC can get full revenge without any hint of simping or whiteknighting of all the (evil) females and all subs/dominatrixes as well as all the female NPCs and "heroines" where the male MC is accused of sexual harrasment and the society, the justice system, as well as the laws support all the female domination (gynocentric society) and got his life ruined forever and he becomes an outlaw and rebelling against all females in power where the males are either enslaved or being 'utilized' as workhorses until dead or becoming sperm factory for the females in power.