 If you liked
Loveless
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 ...then you might like
No.6
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They're both light shonen ai where the bond between characters is very important, but isn't the main conflict of the story.
Both anime feature young boys as the main protagonists, though Ritsuka in Loveless is younger (12) than Shion in No. 6 (15-17). Both live misleading lives, and both meet mysterious people that change their fates forever, with a little splash of shounen-ai thrown in for good measure.