The whole thing runs in a browser tab, which is fine because my phone gets hot enough already. You wake up with a weird boner and some voice in your head saying you're an incubus now. Classic Tuesday. The succubus tutorial lady shows up, all purple skin and tits out, and explains you need to fuck your way through the office to finish some transformation. The writing is AI generated, you can smell it a mile away, but honestly? For a free html porn game, it does the job.
The landlady is the first target. She's got that "I'm not mad, just disappointed" energy until you hit her with the demon charm, then suddenly she's bent over the kitchen counter. The choice system is simple, maybe three options per scene, and half of them lead to the same text with slightly different adjectives. There's a gym scene with a trainer who's supposed to be a milf but reads more like a college student who does crossfit. The boss fight at the end is literally your boss, some corporate lady in a pencil skirt, and you just... dominate her in her office. No combat, no stats, just pick the horny option and watch the word count go up.
The demon girl tag is misleading. There's one succubus and she's more of a narrator than a participant. She pops in, says something about your father's DNA, then fucks off while you handle the humans. The hentai tag is also a stretch, no art at all, just text. If you're expecting visuals, you'll be disappointed. But the text gets explicit enough, lots of "wet folds" and "throbbing members" type stuff. The roleplay aspect is thin, you're always the same horny incubus guy, no real personality options.
One thing that bugged me, the gym scene mentions a "protein shake" but then the next paragraph forgets it exists. Small stuff like that pulls you out. Still, for a quick wank during lunch break, it's fine. Not great, but fine. The transformation mechanic is just a progress bar that fills up after each scene, no real consequence. You could skip the landlady entirely and still finish the game. Which I did, on my second run, just to see if the ending changes. It doesn't.