aroceu's ficWei Ying likes to wear chokers a lot. So Lan Zhan buys some for him. Then, testing their limits, collars.
Wei Ying wears those, too.
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Or, the one where Wei Ying and Lan Zhan accidentally stumble into a BDSM relationship.
Hajime is new to this. But somehow, Oikawa always manages to know how to get him to do what they both want.