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Don’t Say It – bibliomaniac
Bucky/Steve/Tony
35,025 words
Tony Stark is autistic and nonverbal. Which is fine, obviously, except for it means that Steve and Bucky don't have his words, and it only takes him a few minutes to decide they don't need to know he has theirs.
That's also totally and definitely fine, until he goes and falls in love with them.
au: soulmates/soulmarks, autistic character