rule 34 2boys 6 eyes akaza kimetsu no yaiba artist request blue sclera blush body markings breath demon demon boy demon slayer facial markings gay hickey marks implied masturbation implied sex jerkingoff another kimetsu no yaiba kokushibo long hair male male male only michikatsu tsugikuni moaning in pleasure multiple eyes muscular muscular male neck biting nervous pink hair ponytail red sclera sweat yaoi yellow eyes 5674553