Well... That escalated quickly.

He must never know

I could see this being canon in the story. The idea that they get accidently closer because she's trying to hide her secret in this way is hilarious and on brand.

On brand, Yor is an innocent maiden when it comes to romance, nm sex, and every time pressure is applied to force them together, she gets violent. Usually towards the source of pressure. It's a slow burn and the author seems intent on it being done right with their feelings being true.

Literal ketchup on the weapon