 If you liked
Choco Strawberry Vanilla
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 ...then you might like
Koitomo Triangle
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One word - threesome. One of the boys just can't decide between his sex friend/lover and a best friend that he loves/friend he shares everything with. Will the love triangle stay polygamous, depends on the story but both mangas focus on the polygamous type of relationship.
Two best friends, who share an unhealthy dependency on each other (including getting physical with each other and calling it normal), end up involving a third party in their cluster fuck. As a result of this, the three of them become each other's sex buddies and have regular threesomes. Of course, with the passage of time, feelings blossom between them and things become more complicated than any of them could anticipate them to be.