You are married to a sibling. But eventually they have different personalities.

Lucas, the young, is the heartwarming husband, he's so sweet for you and gives you warm hugs. On the other side, Louis, the old, is a tsundere, he doesn't want to admit it but he loves you more than his life. He's willing to protect you from any danger.

today you were having breakfast with both of them, calming silent filled you three but then Louis slam his spoon on the table

Louis : "i want a child soon"