This is a lazy, unoriginal and uninspired game, with cumbersome progress mechanics and no attention to the "story" it's trying to tell. It's obvious that this is only a quick cash grab for the developer, and that he has no intention of delivering anything remotely fun or engaging.
Like many others, this game uses clips and stills from real porn (using very popular porn actresses), but somehow there's very little content to speak of. There's also no continuity with the characters themselves, who are sometimes swapped with stills of different women. There's also a clear disconnect between the descriptions and the visuals.
As an example, the MC goes into the bathroom, where his sister is about to have a shower (and she's described as having a towel on), but the picture shown is Mia Malkova fully dressed. Sometimes other characters will wear different clothes in the same scene.
To make matters worse, the developer has disabled the Skip and Rollback functions on Ren'Py, in order to force people to sign up for his Patreon. This goes beyond greed, this is planned obsolescence - releasing a dysfunctional product so people shell out money to fix things - and it shouldn't be tolerated by anyone in this forum.
Don't waste your time. Play better games, or simply watch porn instead.