I'm looking for a yaoi where as children the uke or the seme moves away and years later when one of them comes back the uke is more manlier and seme-like, and so the relationship is now flipped because the used-to-be uke is now the seme.

I know this is a horrible description, but just something around this line. As long as it's uke turned seme.

Have you tired looking at Seme turns into Uke.

I know there's a few other threads asking for something like that (uke turned seme, or seme turned uke), but none I have have come across, where they were childhood friends, and what was the uke had turned very manly and became the seme.

Yes yes, I know I make longwinded comments, but that's just me >.<
I should proof read my comments more, but I won't...
So keep in mind I'm filled with typos

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Sono Kuchibiru ni Yoru no Tsuyu the only one ive encountered so far

Elektel Delusion

The uke is always imagining the seme that is being fcked by him however it turned out opposite the uke was the one who was being fcked by the seme (the seme looks like uke and the seme also acts like the uke and he was also being targeted by many girls and boys at the school)

 わ た し は 、 あ な た を 愛 し て い ま す   
W a t a s h i  w a ,  a n a t a   o  a i s h i t e   i  m a s u