Kant's Ability.
It was a warm afternoon. Light entered the room through the large windows of the master bedroom, with its white curtains out of the way. Kant had moved into the master bedroom quite recently. He hadn't made any noticeable changes. Maybe a change in his wardrobe, bringing over some of his stuff from his room, but that was about it.
Kant himself lay down on the king-sized bed, with only his long black pants, leather belt, and socks on. His Vantablack eyes had completely dissipated, returning back to his normal jet-black eye color. The change started rapidly, just two days before. Kant had made sure to check a mirror every once in a while to know.