Accept

You accept, your objective is the stone... and he has the key in his neck, maybe you can find the location, steal the key, and use the stone to return to our world.

The noble lord is happy and calls for a priest; the servants run and start to prepare everything for the ceremony.
They take you to a special improvised room to adapt a wedding dress in only a few hours.

But then, the priestess arrives. She confronts you when you are ready to marry...
"I don't believe you, you can't fool me with your magic! If this is true and you want to really marry him, accept my blessing!"

• You can ignore her and ask the servants to escort you to the main hall.
• You can ask the servants to seize her, because she's acting against their lord's will.
• Or you can accept her blessing and marry the noble's lord.