Chapter Text
Izaya had kissed a few humans in his lifetime. Usually out of excitement or his own amusement rather than something genuinely affectionate. He loved all humans equally! And kissing them was kind of mid.
Luckily, Shizuo wasn't human. Izaya should've guessed kissing him wouldn't be like kissing a human, either.
There were some similarities. His lips were warm. Chapped enough to feel scratchy against his own. He tasted like cigarettes and blood. The cigarette taste was unfortunate, but if Izaya kissed past it he couldn't get enough.
Shizuo growled when Izaya pulled away and growled when Izaya bit. Even at little nips! So fussy.
Izaya's lips were always left bruised after. He kissed like he was trying to leave a similar mark on Shizuo. Shizuo tolerated Izaya pulling his lip between his teeth. But complained when Izaya bit down! He was just trying to cover up the taste of cigarettes! Shizuo was not an understanding man.
Shizuo originally tolerated when Izaya sucked on his lip, but then his small brain finally registered that he was trying to leave hickies, and now he no longer tolerated it.
Shizuo grunted when Izaya sucked on his tongue. Lapped at it like it was something delicious. Soft grunts of pleasure that were frustratingly close to moans.
Sometimes when Izaya bit, Shizuo gasped and kissed him harder. Not usually, though. Izaya was still figuring out the discrimination. He doubted Shizuo was aware of it, so he decided against asking, for fear Shizuo would start suppressing his reactions even more.
Izaya never suppressed anything! He could fake such pretty moans before Shizuo got annoyed and told him to stop. Izaya was still figuring out the maximum amount he could moan to get Shizuo to respond without accusing him of faking. He tried not to be so calculating, but it was just instinct.
Shizuo nipped Izaya's bottom lip, and it wasn't fair how Shizuo got to do that while Izaya didn't. But in Shizuo’s defense, Izaya gasped so shakily in response. He didn't think he could suppress that reaction if he tried.
Izaya wasn't good at suppressing reactions in general. Too good at faking, though. He couldn't usually tell the difference.
Izaya's fingers found Shizuo's hair and tugged, earning a grunt. Izaya wasn't sure if it was a grunt of warning or pleasure. He tried again and Shizuo bit his lip harder, which didn't actually solve the conundrum. Izaya whined anyway, his head fogging.
Izaya wondered if Shizuo's head ever fogged… Got so lost in pleasure he had trouble thinking… It happened to Izaya more often than he'd care to admit.
Shizuo pushed his tongue past Izaya's lips, and it tasted of blood, and Izaya ceased to think.