Fics like A Split, A Splice

Blaine frowned at the frayed ends of the thread around his wrist. Everybody was born with a metaphysical thread that coalesced as they grew up. When you followed the thread—when a matchmaker followed the thread—then on the other side was your soulmate. Fairytales told of people who followed their threads to their soulmate, but that was impossible in this era. Instead, you went to a matchmaker, who found your match and tied them to you. Blaine's bond with Kurt snaps when Kurt breaks up with him. When he goes to a matchmaker to try to fix things, he runs into Sebastian, coerced into seeing a matchmaker himself.

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