Responses
This upcoming engagement of Tia and Perez is just a ploy for the empress and it was after "Lorraine and Astana's failed engagement". It was announced in a banquet which is obviously quiet far from the recent chapter.
Perez is just one of the heirs rn, so he can't make any law. That law was made when he became the emperor, which is at the end.

Surprised the empress isn't trying to get her son married to Tia, the obviously beloved granddaughter of the current head of Lombardi and daughter of the maybe heir.
That would be a good plot point.
I'm guessing Lorraine will run away with her little lord and live happily in the East. She deserves it after having parents like that.