Not a manga, but the novelization of Yokozawa Takafumi no Baii from Sekaichi Hatsukoi is that way. I believe Takano was the uke in their relationship, and then Yokozawa becomes the uke with Kirishima. There are 6 volumes of that. They are translated on the pressbooks website: https://ytnb01.pressbooks.com/
Sorry for late thanks....
And Takano was seme and Yokozawa was Uke
Once again thanks for replying.....
Gravity Eyes
Great manga , i've read it a few times now =)
Totally Captivated
Skip-Kiss
Ashita No Kimi Wa Koko Ni Inai
Michiru Heya
Renai-rubi no Tadashii Furikata (second story)
All these are my personal favorites and are really beautiful, some bittersweet and others a bit painful but all are really great manga and brilliant in their own way.
There is more but I can't remember them right now. (￣∇￣")
Hi ......plz recommend other mangas with same story .....where seme with unrequited love turns into uke after meeting a new love (who is seme).......if u know any recommend.....thanks(⌒▽⌒)