I love this too much,
i have some personal suggestions:
futa(/femboy) equipment/part
breast different size equipment/part (something like: flat, default, big, very big)
clothes (i swear I saw clothes for Jun, but can't find them anywhere)
different position for idle Jun, such as: laying on the couch or sitting on the couch.
would be cool if Jun would smile when player is interacting with her enough (such as talking, or head-patting).
whenever Jun would be kissed (specifically on the lips) she would close her eyes I guess.
the ability to clean Jun, at least with a towel or something.
also an arousal meter for Jun (while just interacting with her, not the "frick" part)
I don't know, but if Jun is kissed or just aroused too suddenly to the point where she blushed, her covering her face would be cute I feel.
Maybe an ability to buy a different house, so like: a different interior; Jun is on a bed or a better couch and streaming is also on a bed, same as just sex - on the bed; It would cost a fortune tho and would be purely optional, but players mental state would not deteriorate.
Jun would be sometimes seen with her eyes closed to indicate that she is charging or something, would be a cool detail, and also it would be cool if there was a possibility
of Jun overheating (almost in like an overload way) and she would just temporarily shut down, so you have to stop fucking her too much.
a blowjob option would be cool i guess
Also the game is just so great, I love it too much.
I hope the bestest of luck to the people developing this, the game is improving more and more with each update, I hope that it will all go well with y'all
sorry if i told too many of my ideas, but good luck nonetheless!