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He lies mostly, though he doesn’t have to pretend as much, it's easy filling the part of molly’s perfect boyfriend-he’s already her type, in the senses of him that are a lot like Sherlock, brilliant and mysterious and slightly sociopathic, (though he makes it seem the shy, sweet sort of socially akward that some girls find endearing.) He doesn’t even have to hide that much of his madness, there is a hint of something unhinged in Sherlock, just a spark hiding behind his eyes, dangerous, dormant.
when he tells her he likes her, those parts in him aren’t totally lying.