As far as I remember it was an incest sandbox game. MC went to a big house for a holiday or whatever, where a hot milf, her husband and their daughter lives. There was a maid too. MC phoned his mom and sister from time to time. He is a programmer and one of early tasks was to go to the cabinet and do some work/study. In one of events MC repeatedly met the milf in the pool, with each time the story progressed. The house had several floors. Thank you.