RIGHT?!?!?!? Like, Japan, please get the memo--MOST GAY COUPLES SWITCH ROLES!!! This isn't a relationship between a man and a woman, it's two men. Meaning, they both have dicks, and would like to stick them in each other. Geez! It's not rocket science!
In this author's other work "samejima-kun to sasahara-kun," there's a drama CD extra where they actually DO switch. Very satisfying :)
I mean, it's yaoi. In real life, I'm sure the mangakas and other people know gay couples switch and whatnot. But in yaoi, they often like making the characters fit certain roles, like the Uke and Seme. Plus, the uke often ends up being the girlier one while the seme is the manlier one. Obviously, we know real gay couples aren't like that either. But again, that's just the cliché yaoi trope.
I hate it when they won't let the uke be top talk about hypocrisy. ヽ(`Д´)ﾉ