Absolute garbage shlock of a game. Do not let a good premise and passable models fool you. This only exists to steal your time and leave you unsatisfied.
There is no dialogue past the opening text scroll, and a tiny bit at the end. That means there is no communication between the siblings as they do more things with eachother. Gameplay consists of "cleaning" trash piles with a 'stop on this spot' spacebar press. You do it a handful of times in each room, and you can only do one to three trash piles a day before you have to 'rest' and waste a time slot. Once rooms are "clean" you can interact with your sister, which is just a dialogue-less picture with greyed out options of intimate acts at higher affection levels. Once all the trash is picked up, you can no longer do anything to improve the house, despite there being pests and cracks and spiderwebs everywhere, all you can do is interact with the sister. Affection rises one point at a time, so you spend game days doing the same 5 acts of looking at a dialogue-less picture on repeat until you unlock the sex acts. There is no reason explained, no text, just a very simple moving image, with just unattractive jostling that cannot be considered animation in the slightest. I cannot stress enough how bad these look. Once affection is at 100 the game has a tiny bit of dialogue, another horribly "animated" sex scene, and then you get a big fat "GAME OVER" and the game ends to really drill in that you wasted your time. The gameplay was about 7 minutes of repetitive tasks, and then 15 more minutes of doing the same 5 things repeatedly as an arbitrary number slowly rises.
Don't play this game. Its bad, and it's not even worth downloading to rip the mock "animations" since they are just as bad as the game itself.