The red hair is what gets you first. Not just red, but that specific shade of crimson that makes you think of old anime VHS tapes, the kind where the color bleeds a little at the edges. Natsume's got that look, and the artist clearly spent time on her face, the way her eyes go wide then half-lidded, the slight pout of her lip. The boots are a nice touch too, thigh-highs that stay on the whole time because of course they do. It's the kind of detail that tells you someone was paying attention.
The tentacles though. They're rendered with this weird glossy sheen that makes them look wet in a way that's almost uncomfortable, like they're sweating. And there's a lot of them. The scene where they first breach her ass, the way her back arches, that's the money shot before the actual money shot. The animation loops are short but they pick the right moments to loop, if that makes sense. Her mouth gets stuffed and there's this gurgle sound effect that's mixed way too loud compared to everything else, I had to fumble with my volume slider like an idiot. The squelching noises are fine I guess but whoever recorded the wet slapping sounds was having too much fun.
The facial at the end is excessive in the best way. Ropes of the stuff, completely coating her cheeks and getting in her hair, matting down those red strands. The creampie animation lingers longer than you'd expect, the dripping effect is actually pretty well done. The double penetration scene is where the framerate chugs a bit though, my browser was not happy. I wish there was more buildup before the tentacles go full assault mode, but I get it, that's not really the point. The bukkake finish covers her so thoroughly you can barely see the character design anymore, which is a shame because the art is actually decent under all that. The whole thing is rough around the edges, deliberately so, and it works for what it is. Just fix the audio mixing next time.