Minato looked down too at the blue butterfly tattoo on his chest. He liked that he could clearly see their Velvet Room keys too.

"In December."

With all the events that happened, changes to the mansion and maybe to themselves, not to mention the mirrors too, getting the tattoo was Minato's way of keeping some sense of himself. Souji would know that this Minato was the right Minato.

"It's so you know it's me and that I'm yours."