The colour purple

Summary:
"It's gotta be a fluke," Sero frowned as Kaminari showed him the purple swirl that adorned his shoulder. He looked at the little yellow bolt that sat in the middle of his palm, and sighed, "There is no way,"

"No fluke dude, I swear I won't cheat or anything, your my soulmate, period," Kaminari told him frantically, he had wanted to share his second mark since they first got together, but he'd been a bit scared to.