"In exchange for fortune and wealth, fame and health, you shall offer me your firstborn upon their coming of age."

A classic pact—yet in stories, one rarely knows what becomes of the firstborn.

Congratulations: you are about to find out. You are that firstborn, and you have just blown out the candles on your birthday cake.

Silas — the sorcerer raised by a demon and accustomed to using dark magic and contract magic — didn't wait for the party to end to come and claim you.

Objective ? to make you his... wife.

He already call you his "Bride Boy"...

Yeah, not his husband, but his wife.

He is over two centuries old and has a rather... old-fashioned view of couples.