So, I played all the available content, I have some ideas for Dev.
1. Text skip button.
2. Cut out choices that are "Yes" or "Of course." If you want to leave "choices", so make the messages more interesting, saying "Yes" 5 times in a row doesn't seem natural.
3. It would be interesting to use the discussion about the rules of her sleeping with others to activate and deactivate content in the game, I don't want her to keep asking me if I want to have a threesome with her friend when I have already refused.
4. Having the choice to "ignore" her messages so she can choose whatever she wants at random could be an interesting idea, especially for those who want to play the submission route.
5. Using Instagram could be a good way to create tension in the story, when the GF goes to the bar with her friends, they can take photos of the GF talking or dancing with other guys, or even make her appear partially in photos leaving a situation unclear.
6. Using the GF's friends more, the story was good but there was something missing in the middle to give it better pacing.
7. The idea of her not sending photos of what she's wearing to MC, or making you choose between receiving the photo or sending it to a lover is really hot! I want many more choices like this with unusual consequences, perhaps sending the wrong photos of her to a cousin, friend, or co-worker.