The game

[T_B]

You find a game called your life on your computer one day you play it and can see that in your house was your mom in the shower your sister in the living room and a symbol of your dad that said at work and a symbol that says you are in your room curious you leave your room and see your sister in the the living room and your mom is taking a shower

You go back to your room and clicked on mom's symbol and it had stats like love, lust, relationship level, even a not pregnant symbol you can even influence her a little bit you try it thanks to her love stat for you she let you touch her over her clothes but when you tried to go under her clothes she stopped you

Checking the game said that her love went down a little for trying go under her clothes and her lust went up when you was feeling her ass and boobs over her clothes 

There is even character profiles

The mom housewife loving mother and loyal wife she is shy about showing off her D cup breasts and keeps her pussy shaved for her husband

The sister she was dating her best friend but the friend realized she wasn't a lesbian and they went back to just friends but the sister still had feelings for her even as she dates her friend's brother to hopefully make her jealous she has C cup breasts and shaved pussy

The dad loving father and loyal husband does his best for his family he had the option to get a promotion all he had to do is convince his wife to sleep with his boss but immediately turned it down saying he wasn't going to whore out his wife and worked hard to get the same promotion though hard work

You decided that you will make you mom and sister yours using the power the game has 

The mom can only have sex with the dad and her son and once the son reaches a high relationship level with her she stopped have sex with her husband only became the son's lover

The sister can only have sex with her best friend (in a memory that the found in the game) her boyfriend and her brother with a high relationship level she brakes up with her boyfriend and becames her brother's lover

 Optional memory sex to see the mom with her husband and the sister with her exgirlfriend and boyfriend and threesome with the son, mom and sister

The characters names are up to you