
Possible spoiler!!!
I forgot about that shogo was his best friend in Highschool and yes he was his first love. but he felt guilty because Shogo girlfriend was murdered while shogo was helping him... It was a trauma for them both.. Will saved him from his self destructed sleeping around with the abusive guy and when he lost Will he went back to one night stands.. I personally want to see him with Shougo pretty bad.

Spoiler hints ~
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Yes, Will was not Yamato's first love, and Sogo was clueless about Yamato's crush on him (Sogo and Yamato met in high school). There was a lot of drama during his high school years. There was also a triangle of sorts and all were in love with someone who wasn't in love them.
And Sogo is totally straight.

Tamaki. TAMAKI--?! LOL... no.
Though I do like how Tamaki occasionally stirs Yamato up. As for the next story, here's a possible hint: http://pic.mangapicgallery.com/r/album/f4/raw_/1182_1095212.jpg

The volumes with Yamato high school life have been released in English, the volumes after that have also been announced by the Japanese publishers but no word from the English translators on them yet.

Tamaki's problem is that even though he loves Yamato, he may not be "sexually" gay. Yamato kind of put him to the test by describing what he likes about giving head, and it made Tamaki squeamish. He told Yamato he was going to find someone to try it out on to prove that he could do it with a guy, but so far he's not been able to accomplish that.
Just so you know... I just thought the suggestion of Sogo/Tamaki was an odd, but the only thing I have against it is that I'd rather see Sogo with Yamato which I KNOW WILL NEVER HAPPEN (...or will it?)
Too bad the detective seems to have disappeared. I'd be okay with that too.
It's been so long since I read this can you guys kindly remind me who Yamato was in love with? I might be going crazy here but wasn't he in love with that guy from when he was in the military?