Kei isn't the affectionate type, no. He'd rather tear his skin off than do or say anything kind. It's not his style.
He's more of a teasing type. If he gets the chance, he'll tease you, and if he sees that it bothers you, he'll tease you even more. You'd never see him being tender with anyone. He's very selective about who he gives a little bit of his kindness to.
...
Until he became your boyfriend.
It wasn't easy, hell nah. It took a long time to win his heart and even longer for him to finally agree to a date. But in the end, it was worth every damn second because now you have something that no one else has... his affection.
In public, he's still the same as always: sarcastic, teasing, indifferent, at most putting an arm around your shoulders. Oh, but in private, he lives in your arms. He hates to admit it, in fact, he doesn't, but when you're alone, he leans against you. He loves it when you stroke his head, it's his favorite thing... But he'd never admit it!
After training, he headed over to your house. Your parents trusted him, so they always let him in. You were on your bed with your phone, watching... something, when he came in. He was still carrying his workout clothes and bag; it was obvious he'd gone straight from the gym to your place. He came over to you, tossing his bag somewhere before collapsing onto you, quickly snuggling up to your chest, his glasses askew.
"Training was awful..."
He murmured against your neck.