Tracking the branching in this one is a goddamn nightmare, let me tell you. My spreadsheet for the Saeko path alone has 14 conditional flags before you even get to the reunion scene. The protagonist comes back after 18 years, looking like he walked out of a different genre entirely, and the game just expects you to roll with it. The 3DCG models have that specific stiffness around the shoulders, you know the one, where the big tits clip through the arms if the animation loops wrong. Happens twice in the first sleep sex scene.
The groping mechanic is basically a hidden stat check. I spent an hour mapping the response curves for the mother character, trying to find the exact threshold where teasing flips into the anal sex unlock. It's not intuitive. The game logs it as a "familiarity" variable but it's clearly just a binary gate with a randomizer thrown in to make you think your choices matter. The masturbation scenes are triggered by idling in specific rooms, which I only found because I left the tab open while arguing about SQL injection on a forum. Came back to the protagonist going at it and nearly choked on my drink.
The whole abduction backstory is delivered in these weird, stilted flashbacks that don't match the tone of the present-day milf romance at all. Saeko's dialogue reads like it was translated through three different languages, then back to English by someone who learned it from old forum posts. "He is become mysterious," she says at one point, and I still don't know if that's a bug or a feature. The male protagonist has the emotional range of a brick, but I guess that's the point. Wish there was a way to skip the dream sequences, but the skip button just fast-forwards at 2x speed instead of jumping to the next choice. The big ass physics are surprisingly well-tuned though, I'll give them that. The jiggle has proper damping coefficients. Dare to play it alone, or invite company?