You ever dig through the corners of nutaku, not the front page stuff but the fifth page of search results, and find something that looks like it was made in Flash MX 2004 by someone who just learned how to tween? That's this. The whole aesthetic is this raw, early 2000s doujin soft feel, colors a bit flat, lines a bit shaky, Rukia's hair looking more like a purple blob with bangs than actual hair. But there's something about that unpolished energy that hits different when you grew up on limewire corrupted files and praying a 30 second clip would actually download.
The core loop is just watching Rukia go to town on Ichigo's cock with a focus on how her lips stretch around it. The animation loops are clunky, just a few frames repeating, but the deepthroat scene where she pushes down until her nose is mashed against his pelvis got a genuine reaction from me. Not because it's technically impressive but because the artist understood what we're all here for. The sound design is pure old internet too, that wet sloppy gagging noise that's clearly just a stock effect warped slightly. It's partnered with some almost clinical cumshot physics, a massive load that paints her face and tongue and then just sort of clips through her chin model incorrectly. The swallowing bit at the end where a stray drop of it runs down her lip while she looks up with those dead purple eyes is the exact kind of messy detail that sticks with you. Ichigo barely moves, just stands there with his massive shikai sized dick out, which feels right. Let's be real, in this scenario Rukia is the one doing all the actual work.