Yellow is I'm close to my limit, red is stop everything immediately.
You deserve better than that even before any threat of violence.
That is what is best in every situation in a relationship.
I would have waited a bit more paitent and put you ro bed for a nao first.
Some people like pleasure spanking, but not discipline spanking, and vice-versa.
When it's BDSM, all it takes for everything to stop is one word.
Your boyfriend can use several tools besides his hand to spank you.
He is serious.