As is typical with Bo Wei games, a lot of your enjoyment of it will hinge on your appreciation of the specific premise. If the idea of you being sexually controlled by a younger sister who does basically nothing to actually make you do it beyond just sitting there and being hot, then you will love this game. The way that all of the interactions are driven by you approaching her is a huge part of why I find this game such a fucking turn on. She just sits there on the couch and you keep crawling over to giver her more money so you can get off over and over. It's a really effective portrayal of a very specific kind of relationship that I absolutely dream of being in myself. Every time I reopen this game its like I'm doing the crawling back for real.
The game, however, is quite short, and offers basically no content beyond shelling out money to your sister. While it's good at what it's doing, it doesn't offer anything else. So, to reiterate, if you also find that idea hot, I think you'll like it, otherwise, you may think its meh.