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Family (husband, wife, & daughter (loli warning!)) homestay a foreign college student. Typical husband is sent out of town for work scenario, giving the student an opportunity to seduce both the wife and daughter. You have to start with the husband's (Tohru) POV, but as you progress you can switch to the wife (Akie) or daughter (Riko) POVs using the games's flow chart (make sure you don't select reset - that clears everything and you have to start over).
My suggestion is to quickly play thru the husband's POV to the point where he has to make one of two choices. Then use the flow chart and switch to the wife's POV. Count the husband's blue squares from left to right to the 13th square, then select the same square below for the wife's POV. This is when the student starts making his moves on the wife. Game has multiple endings based on the choices in the game.