????????

Dark Heaven

If you mean like reversible, neko x neko is good
http://www.mangago.zone/read-manga/neko_x_neko/

Following. It's easy to find some manga where they flip the roles ONCE (and there's a lot of lists here for that), but if it's actually actively switching up from time to time like you know...real people, I have yet to see that

Yeah, thats one of the reasons I don't really see yaoi as an example of realistic gay couples, more like just it's own separate thing since it follows it's own rules with couples. I still like it but I by no means see it as anything more than what it is.