It's a shoujo so not exactly what you asked but it's still a great friendship story ^^ http://www.mangago.zone/read-manga/kare_no_aijou_no_hakari/
I'm sorry I couldn't think of any among the shounen ai and yaoi ones :s
Thanks everyone for your responses!
@Raku, About Unripened Expression, I don't really know since I've only read the chapters translated on this site so don't mind!
What I meant is that I really like Jae Won and Jun Seo's friendship till now (ch 33) so I was hoping for another manga (yaoi or not! Don't worry guys!) with similar vibes. I really like when friends help and support each other!
http://www.mangago.zone/read-manga/smells_like_green_spirit/
I reeeeally like this one. It's one of a kind!
Hi guys, I just read this manga http://www.mangago.zone/read-manga/doutei_ni_ai_nante_sakebenai/ and I really liked the friendship component. I was wondering if anyone can suggest me a manga where the characters are gay but remain friends and do not fall in love with each other (like in Unripened Expression), or at least yaois where friendship is the main theme (even if they fall in love). Thanks in advance!