[Fanart] Stop doing what you. Keep doing it too, by saignant – S.C.I.谜案集 | S.C.I. Mystery (TV) [Archive of Our Own]

Zhan Yao: Don’t use those cuffs on me again!
Bai Yutong: It’s not like I didn’t use them on you before.

Source: [Fanart] Stop doing what you. Keep doing it too, by saignant – S.C.I.谜案集 | S.C.I. Mystery (TV) [Archive of Our Own]

So, apparently the exchange above is canon…