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This one, I highly recommend. It starts out with the buffer one being the bottom, and he stays this way throughout the first story. But at the end of it, the seme starts wondering how it'd be like to be topped once by his boyfriend.
http://www.mangago.zone/read-manga/shigekikei_my_hero/
Then it continues here, only one chapter, unfortunately, and the seme is still the top.
http://www.mangago.zone/read-manga/shigekikei_my_hero_dj_ore_no_honki_o_misete_yaru/
But then there's one more chapter, which hasn't been translated yet (*cries*) where you can see them switch.
https://myreadingmanga.info/gehlenite-ryo-omae-no-kakugo-o-misete-miro-jp/
Anyway, I really recommend this one, it's so heartwarming and it has an amazing development (⌒▽⌒) Super hot too!
Is there actually a BL manga with a reversible couple? ( • o • ) If you've read good ones, please recommend some. It'll be my first time though ahah I'm a little curious how things will go.