For me in this game the best kinks are :
Submission & domination (mc can be in vote situations depend on choices or story)
Water sports can be cool
Light bdsm (or hard) can be cool too
Obviously male on Futa and Futa on male at the same amount depending in mc choices (everybody Will be happy)
And optionnel NTR between futa (futa on futa) maybe somes threesomes futa futa male (lot of combinaison possibles)
And more Classic sex like oral, anal, …
that can be cool to to have differents type of futa character (aliens humain like, alien humanoid, furry?, like in spaces multiples spacies live not only humanoïde like)
and for the scenario you can have 100 possible direction, maybe the need a man for a particular reason (they are the best breeders in the galaxy? x) ) The scenario can have unlimited interesting way to be done, it can be Space exploration on the ship, it can be a sandbox in the planet of the futanaries (mix with Space exploration), it can be an adventure story like the futa need to find something in the galaxy and they go on different planets for find ??? And when they pass on earth they see your specie (human) are good at reproduction way more than other spacies so they keep you under Arm and 1 human male is enought.
(Maybe humanoid futa capture you because youre a good futa breeder for create a big army and fight the futa alien ennemy)
Somes randoms ideas from my brain ahah
But that can be cool if this game handle a large futa lover orientations with some optional choices (futa on male, submission domination, …)