If you take additional input from us, then I have a few following points I want to mention.
1. The pacing is too fast. I know it's a porn game, but it the transition of exposition should be gradual. By this I mean that on the first day the blackmailer should just request a shot with panties or panties pulled to the side. (another side element can be here if the player does not accept it that our sister receives more pressure or some sort of punishment). Then later or on the second day it could go further. Mental barriers are easier to break if you do it gradually. From a development side this sadly means more work though.. (more scenes and CGI..)
2. Maybe later on do poses in certain locations? Like spread pussy in the toilet or in a bench in the park? Variety keeps the fapper happy.
More work with the CGIs though...
3. Do not remove the bush!
Please.
4. Underlying reason to develop exhibitionism is missing. A prologue scene where the main heroine checks herself out? Maybe comparing herself to other girls? All girls think they look ugly compared to other girls..also would start the implication that after starting to expose herself she starts to accept her own body more and more. This would give more reason developing exhibitionism.
5. Currently there's not much reaffirmation. As the main heroine will delve deeper into this fetish a second character can reinforce the idea that this can be considered "normal". Introduce side a mousy side character who re-affirms the current exposition (making nude selfies and exposing herself) as normal. (Example: side character has a boyfriend and she likes to tease him, but normally you would not think of her as someone who would do that). This is heavily dependant on the story type though.
Well overall I'll be happy if we get more spread pussy shots and more nude selfies.
I'm eagerly awaiting the next release.
EDIT: Of course these are just quick tidbits from me. This is your game and you do you mate! I'm just finally happy someone struck my fetish.