Katsuki and Izuku proved that knew they were soulmates before they even got their marks. Izuku knew it couldn't be anyone BUT his Kacchan and his wrist proves it. Izuku also knows that Kacchan just gets angry sometimes. He still loves Izuku. The burns and bruises and scars across Izuku's body are just ways that Katsuki shows his love for him. He's just teaching him lessons to keep him safe in the future. Right? #2 in ShinDeku - 2/24/21