Sorry if the text is unclear, my english is bed.
More types of chastity cages
Optional (switch in options menu) sounding scenes.
More items with special effects, like VR Headset, that can be dropped by bosses.
More visual effects in сharacter, like breast size, hair length, penis size(Bigger if a lot of sex, smaller if a lot of anal or chastity).
Curse of orgasm denial, and if you don't break it testicles make large and blue and maybe it it take a damage
More effects from pain
Saxy-cat suit, sexy-wolf suit and etc (plus more types of buttplugs)
Erotic spells, maybe that open unique scenes and allow you take the initiative
A special effects, if you fight (or you get fucked) totally naked