Responses
Try Core Scramble by Jun Euho. It's manhwa; which is close to yaoi, but it's shounen-ai. Don't know if you've heard or read it yet, but the MC uke kinda in a way has 2 love interests; 1 seme who's kind of an asshole, while the other seme likes him. I've read it, but I'm gonna leave it up to you if you're interested in reading the book. Oh, the artist's name may be spelled differently since it's korean.
Looking for any yaoi manga where the uke doesn't end up with the main seme (or vice versa with the seme not ending up with the main uke)?
For ex. In hiruaka no ryuusei (spoiler if you haven't read it) Suzume ends up with mamura rather than sensei?
A pretty difficult find imo. Personally I've never come across any yaoi where the main uke ends up with the other seme rather than the first person he met.