Aoyu are both telekinetics and hypnotist. So they can either just push the pleasure spots telekinetically or brainwash you to have increased sensitivity or make you feel pleasure for no reason at all.
Kii allows for some truly depraved chi f*ckery. Such as impromptu BDSM session anywhere and any when by making the tools and binds out of chi, making a silent vibrator from harmless chi sphere for some exhibitionist play, or coating their 'sword' with in a layer of chi which can then be manipulated to make it do things no normal 'sword' can do, like rotating knobbed drill when inside the 'sheath'.
Honestly, Kii might be THE freakiest and best style you can have for bedchamber art, since other than direct modification of your partner like Kuro and Aoyu could do, you can basically fulfill any fantasies by manipulating chi. Midori has big sword and Aka can 'sharpen' or 'strengthen' their sword. Whoopty-f*cking-doo. Nothing special, unless Midori can shapeshift their 'sword' into other or even impossible states, like having two at once (Asura exclusive? LMAO)
Truly Aka is the style for eunuchs.
View attachment 38618