/jp/ - Otaku Culture

So, there's not really that much, especially when you take out the mediocre stuff.

One of the best is ふたりがけ催眠 ドライトレーニング編, where a pair of adorable twins tease and encourage you towards reaching an anal orgasm. The downside is that you need an aneros to get the most out of it. I've never liked using my aneros that much, but together with this file it's intense, probably more so if you use the training parts regularly. Now that I think about it, I should do that.

朝倉催眠診療所 vol.04 is similar, since it also requires you to use toys, including the aneros. Felt pretty good, and it has more of a femdom theme, but it's not as good as the one with the twins.

A hidden gem I discovered which I'd usually have overlooked is the BL series (BL催眠, 続BL催眠, and 後輩にいいなりBL) by kinoko, all available for free on her blog. It's easy to overlook because of the BL part. It is targeted towards fujoshi, but as long as you take out the file with the male transformation and pick the file where she explains she's a futa, the scenario is actually that you raped by your tomboy futanari kouhai.

I also liked HypnoDevil by モルモットストリップ. I heard other people didn't like it as much, but it's one of the few decent ones that doesn't require toys or anything, which elevates it high for me.

Can't think of much more I can recommend in good faith. The tentacle girl, slime girl and alraune files by 誰得催眠製作所 all involve anal and they're good files overall, but they're more full-body stimulation than anal-focused.