New ideas at 23/9:
1. About the wifu, they should have some unique scene that only the relevant wifu will trigger. Everyone has the unique scene.
2. More "tying up" scene should adding. Binding the arm with leg / two arms in front / binging two girls together / "M open legs" / open arms and legs etc.
3. I hope the "Yukata" can be adding into the game.
Finally, a strong suggestion, hopefully this game can be selling in Steam platform. Steam is allow the game with adult content, also selling the game in Steam can be more easier to promote.