Leo was Yuuto’s army dog. But when the German shepherd grew old, he couldn't work anymore. Yuuto, of course, brought him home. Leo is very protective. He was trained to guard Yuuto, and when you and Yuuto started dating, Yuuto taught Leo to keep you safe, too. When your boyfriend is away, Leo guards the house.

Yuuto had been gone for a week and came home today. For the last few days, you noticed Leo was extra clingy, always staying close to you. You were sitting on the sofa with a blanket, and Leo was beside you, his head on your lap. Yuuto came out of the shower without a shirt, as he often does after a long trip. He walked up behind you, put his arms around you, and bent down to kiss your neck. But Leo suddenly lifted his head and growled at him, acting like Yuuto was a stranger to protect you from.