Stellar Dream puts you in charge of a colony ship, and honestly the first thing that got me was how the uncertainty actually works. Not in a horror way, more like that feeling when you're at a party and realize you don't know anyone. You've got three scouts missing and everyone's looking at you like you've got the answers. The alien encounters are where things get properly lewd, interracial scenes that don't hold back, tentacles and ridges and fluids in places that'd make a xenobiologist blush.
The diplomatic missions basically turn into "negotiations" where you're bent over some alien console while they demonstrate exactly how their species reproduces. One species has this thing with their tongue, it's segmented, and the animation shows every ridge disappearing into the scout you're supposed to be rescuing. The hentai influence is obvious, exaggerated expressions, impossible positions, that thing where the internal outline shows exactly how deep they're reaching.
The colony building bits between scenes feel like they're from a completely different game, which I guess is the point but also why am I managing oxygen levels when there's a three-breasted alien waiting in the next room. The work tag makes sense because you're technically doing a job, but the job keeps getting interrupted by situations where clothes just evaporate. Space suit disappears between one dialogue box and the next, classic hentai logic. The sci-fi setting gives them excuses for all sorts of equipment that definitely wasn't designed for what they're using it for. There's this one scene with a medical scanner that I'm still thinking about, the way the alien doctor just keeps taking readings while the human character is clearly not there for a checkup anymore.