With Boyle becoming increasingly simpy and with Rosa feeling a little more empowered by the captain being out and proud aswell, Rosa decided to do something.

Boyle was flirting (badly) with her as usual so she just gives him a deadpan look and says: "Yknow I'm not into you, right? And I have a wife."

This earned her a shocked response from a big part of the police station and a bit of disbelief.

Peralta: "Nah, we want proof. Who is fearless enough to marry you?"

Diaz: "I can call her to the office right now?"

And that's how you ended up walking into the Brooklyn 99 police station.