preferably if its a middle aged guy but i'm cool with all ages. or even the reverse where the uke wants to become the seme.

must haves:
completed or ongoing scanlation
english scanlation
yaoi(even if its rarely to never shown explicitly)

Fujoshis rule!

By straight seme, do you mean like a regular straight guy who later agrees to be the uke or a seme who later agrees to be the uke, because I don't think it's possible for someone to be both? 😕

I think it's the second option, a seme who also used to be straight later becomes the uke.
The Reversible couple category should have what you're asking for.
I have a terrible memory, but maybe someone can recommend a few titles too? hopeful 🙂

Haru o Daite Ita and Kyuuso wa Cheese no Yume o Miru

sorry ive been without wifi for a while so i only just saw all of your replys but it is indeed the second one.

1. straight guy becomes a seme because of yaoi logic
2. the uke is gay and wants to be the seme for a change
3. the uke wins and the straight seme becomes the uke (this can be temp or permanent. seke or uke either is good. mwahaha)
4. success

im going to read the 2 you linked right now. 😀

Fujoshis rule!