Let’s get down to the short of it before making people read the full analysis: @Reiko (Reikodium) @Lysander (KannaScape), @Kasumi (Kasumi Projects), and potentially others are the same person or group, and also Tentacles Games, and a number of other short-lived groups. I don’t know what the long-term aim here is, or why they feel the need to do this, though the deleted Patreon pages for at least one of these groups could indicate a scam - get people to pay in for a few months with the promise of big updates around the corner, only to vanish when the scope becomes too large or the money starts to dry up. However, that’s only speculation on my part; I can only say concretely that this person or group is operating a network of accounts for unknown purposes.
To start with, the link between Reikodium and Tentacles Games isn’t even hidden. Reiko’s itch pages for all but their earliest title ask the user to check them out on TentaclesGames.com - an AI-assisted itch scraper that auto-creates pages for games tagged as adult content, not something the game’s author has any control over when the AI inevitably generates misinformation in its Q&A section, and whose helpful DMCA button is absolutely non-functional. Even more critically, the game pages on the site are currently all broken, deliberately or otherwise - while in the past the buttons to take the reader to an itch or patreon page have appeared to work, currently they all redirect to Reiko’s newest game on itch. From this we can conclude that the same person or group operates both.
Now, Tentacles Games and Reiko’s games and accounts follow much of the same setup, even where the artstyle isn’t identical. The games are all made in Godot, all have web/Windows/Mac/Linux/Android builds available, and all have segregated tiers of free and 1-2 different paid builds, rather than older full builds later being made available for free. There’s a slight deviation in Reiko’s oldest game only having a paid build, but from the artstyle and animation, and the general trend of ‘borrowing’ popular copyrighted characters rather than making their own, we can conclude that this is indeed still one of their works. Additionally, many of them have apparently empty Youtube pages, and empty or near-empty/retweet-only Twitter/X accounts, while following the same general template for the store page setups.
From there, cross-referencing other Godot games that follow most or all of these patterns with games featured on the Tentacle Games blog or sidebar makes it easy to pick out a number of other accounts, and just browsing the itch tag for Godot makes even more stand out. KannaScape’s games are the most obvious here - not just because it’s the content we’re most likely to discern, but because Inflation Inc. has been featured in the sidebar since the sidebar has existed, and their games also top the blog posts for Top 10 Weight Gain Porn Games, Top 10 Cumflation Porn Games, and Top 10 Belly Expansion Porn Games. The other sidebar games also follow the same pattern, pegging HelloArisu (expanding to Steam! Good for them, although I don’t think Valve’ll look kindly on the blatant IP theft) and HotaruPixie (note the Page Removed notice if you try their Patreon) as part of the network. Going through the blog posts also nets a number of new ones - naturally, the point of the site appears to be to drive traffic to their projects while trying (and failing) to appear neutral. TOP 24 Tentacle Porn Games avoids putting their games right up top but still leads to Hina Aozora (whose oldest game bucks the trend and uses SRPG Studio), katwhorm, and Yukari-chan (hey, this one’s got a SubscribeStar too!).
Looking at non-promoted stuff is where it gets a bit more nebulous. It’s pretty obvious from the template and artstyle that Kasumi is another alias, and despite their game recieving some actual development attention I’d hazard a guess that HoruBrain is as well, down to the game also drawing heavily from SCP stuff, similar to Tentacles Games. I highly doubt this is all of them, either, as not all of them use the exact same patterns and some may deviate entirely.
I’ll admit that it’s possible that I’m reading too much into this - that beyond the link between Tentacles Games and Reiko, the fact that their site just happens to frequently feature games with similar interests to their own using the same Godot templates, same handful of animations, and same store templates could just be a complete coincidence! But I’d wager the odds there, out of all the adult content on itch, are astronomically low.