Hello! And I'm talking non-incest kind of brother-complex(although I don't mind if you actually suggest them), but where preferably the uke has a brother who is overprotective and/or the uke looks up to him.. which might hinder his relationship with the seme a tad bit.

How about Super Lover or Brother X Brother?

There's shitteru yo. - it's really short
love stage- haven't read that yet but I know that the elder brother has a major brother complex.
M Nano? Baka Nano? Hentai Nano? - now I wouldn't usually recommend this because the uke is super twisted but the brother definitely hinders their romance.
If I remember more, I'll pay a visit again.

Thank you! Please do recommend more if you know. ^^ I've read Super Brothers a while ago though I'm not really a fan. Brother X Brother is one of my favorites actually, so sad!

AH, I love Shitteru yo! I just read it recently, thank you for recommending it to me again. I kind of liked the jealousy the seme seemed to show too. I don't think that's the Love Stage you wanted to recommend, though I know which one you're talking about. Not for me though I did like the brothers over protectiveness. M Nano... God, I love that one! Though it's not the uke who is super twisted, but the seme. I still like it, it's funny so thank you!

When I read your post and clicked love stage , I was like what the hell is that? Hahaha.. Forgot the "two exclamation marks". And yeah the seme was twisted...my bad.
Anyways here we go again:
merry go round -brother complex is definitely there but because I haven't read it full so I'm not sure about the hindrance part.
chara cafe relish ni oide - complex and hinderance but I read it a long time ago and I'm pretty sure the story wasn't to my liking ;anyhow you can always give it a try.
nirameba koi -even though aniki came for only one chap, it was pretty hilarious.
virgin star -cliche story but mega hindrance
ryouri danshi no kakushi aji -not complete yet but I can sense super dark protectiveness from the brother. Will just have to wait for more updates .
kitto kiss o suru toki -complex......yeah but the brother is probably doing that to make the dense mc realize his love.
That's all I got after a thorough session of straining my brocon reserves.
Hopefully this shall keep you going on for a while.

Warui Koto Shitai or Warui Series by Sakuraga Mei

Nekoka Danshi no Shitsukekata This is currently ongoing and it's shounen-ai. However, the brother complex is gearing towards incest.
Sick Completed and the brother complex is innocent. It does interfere with the relationship though.

lιvιɴɢ ιɴ α yαoι woɴderlαɴd
-QaF-