Being obsessive was in Kids personality, it was who he was.
He became obsessed in his hobbies, in symmetry and art, in his job as a grim reaper and in his school work.
Perfection required obsession. That was apart of Kid's philosophy.
eventually he grew obsessed with Crona.
ironically, he thinks, he became obsessed with them before even meeting them. The legend of the black dragon intrigued him, which led him to hours open hours of reasearch. He grew crazy with the idea of the ghost ship, a mysterious dragon with power beyond imagine.
When he first met Crona, on the Nidhogg and saw everything he Envisioned in one soul, he undoubtably grew obsessed with Crona. In finding them and defeating them, and eventually changing it to befriending them.
But his affections began to grow outside of just comforting friends. Soon his desires started to grow beyond a simple friendship. Casual hello's and greetings weren't enough, couldn't satisfy him the way his picky soul wanted. He yearned to learn more about them, were they grew up, what they thought about the world, their favorite color. He wanted to know everything.
He became obsessed with crona, in seeing them and touching them, in kissing every inch of their face and holding them close. Leaving symmetrical love bites down their neck to hazardous ones up their thighs. He never grows board of the way Crona gasps at the unusual touches, affectionate and sensual. The way they throw their heads back and toes curl, as if it was the first time every time. Kid anticipates every shudder and moan, trying to make it more powerful than the last.
Hes obsessed with order and calm, and the way when he's alone, Crona will grab his face with a grip so tight and commanding he almost forgets to kiss them back.
He remembers how positively obsessed Crona is over him, too.
