It would be interesting if fawn or rinny have you wear it for long periods of time so you're stuck in max lust and have to surrender for every encounter and maybe if try to cheat it by only sleeping until the duration pass they'll punish you
Would you make special versions of the chastity for the futanari and hermaphrodite and maybe idea for marin route have her lock Lust in a special chastity cage/belt with tentacle inside them(kinda similar to meat parasite when they attached to your crotch) or even make the cage/belt sentient so you have to please the chastity cage/belt to take them off (basically recycling the tentacle bra and panties)