Great game, great story, great love scenes, and great art. Bad intro 'warning'. 

gameplay: simple but makes you pay enough attention to choose the right answer, this is nice because it builds the characters up.

art: it's somewhere between anime and western animation, and I really like this style of art a lot.

H-scenes: dialogue heavy to be sure, but well written, and very nice reward for the slow build up.

story: it's an interesting take on this form of dubcon and plays out very well. the snowed in thing only helps make things more steamy and you get the feeling that even if your a weird pervert, you are in some way helping your family

rant: this game would get five stars, but I have a strict policy regarding accurate tagging and warnings in my games. Don't get me wrong, thanks to publishing treating step-incest and 'real' incest as the same exact thing, I've just fallen into the habit of writing only 'real' incest unless I have a particular story I want. or if I am seeking a specific vibe that only step-incest has differently from 'real' incest. So when I play a game and it tells me that it's step-incest, I expect that. Thanks to having identical twins this is clearly 'real' incest and I feel a bit lied too. Granted, I honestly think the 'real' incest works better here and prefer it myself. like the 'get back inside of mommy' kind of humor. but there's no need to lie when publishing studios such as smashwords would treat step-incest and 'real' incest as the same. your only trying to pretend, and it could end up being a bad experience for someone playing your game if you tag incorrectly. imagine if a booru forgot to tag for the really evil stuff and you saw things you were not comfortable with? 

so in part thanks to this rant, I will subtract a single star and give you four stars. still an amazing game but I praise direct honesty from my creators as the highest value. if some really evil and heinous art is going to be more honest with me about what they are giving me then the lighthearted stuff I actually enjoy... something is very wrong with the world.

Edit: as time has gone on, the choice to LIE about incest romance, has made me increasingly more angry. we will never win the war if cowardly devs keep lying to us. One star for lies.