
If you haven't read one before, this is dom/sub universe. It was the first alternate universe I read after a/b/o, and personally I really enjoy it (even more than esper/guide, and ESPECIALLY more than the newer fork/cake :P ) Basically if you didn't know or figure out already, there are doms who are "S"s and subs who are "M"s, and the rest of the population are norms with no secondary gender. Subs and doms do "plays" together, which can be extremely basic (the example here being feeding the other) to intense (BDSM/sex) which satisfy the desires of both the doms, who have a need to dominate and give commands, and subs who have a need to obey and be rewarded. As part of a play, "commands" are given by the dom which the sub instinctively obeys (but can be used nefariously, too). Commands are often bolded or in a different font or background color. In a trusting relationship, both the dom and sub are satisfied, but they do not necessarily have to be romantic partners (of course usually end up as such in these stories). However, if that trust is broken, or the sub is not properly given after care (praise, rewards), they may experience "sub drop" which can be detrimental to their mental and physical state. On the opposite end, if the sub is completely trusting of their dom, during a play they can enter "sub space" which is a euphoric state. As proof of an established dom/sub relationship, the dom may give their sub a collar (or something akin to it). In some dom/sub worlds, there is also such a thing called a "glare" which the dom may use to fend off other dom's, but it can also negatively impact nearby subs, too. In a few of these stories, there are different ranking doms/subs which are S, A, B classes and so on, but most of the ones I've read don't have that.
Anyway, there's a crash course of the dom/sub world, if that's what you needed ╮( ̄▽ ̄)╭ Happy reading!

Lol sure sure, hope this helps you find something new that you like (づ ̄ ³ ̄)づ
Ii Ko ni Dekitara Hometekure
Discipline Me. Melt Me. Expose Me. Love Me.
Kocchi Muite Glare (totally love the art style, but not fully translated yet)
Collar Kiss
Zettai, Fukujuu Meirei
Osuwari, Yoku Dekimashita
Yarashiku Shitsuke Kete Itoshite Ageru -Dom/Sub Universe-

Okay, not necessarily a fork/cake fan, but I've looked at a few - though god I can't take them seriously! It's essentially kind of like a/b/o but with "cakes" and "forks." Cakes being people who taste sweet to forks, who can't taste anything except their one special cake. And I guess tasting is like licking/tasting bodily fluids/cannibalism/honestly I don't really know. They have a thing for anybody who is a cake, which usually means sex, cause yaoi.
i’m so confused w this secondary gender.. like.. i understand a/b/o, esper(?)&guide, but this..? i don’t understand.