Rule34.GG

Regular 6 eyes
abs
black hair
boss and subordinate
couple
demon
demon boy
demon girl
demon slayer
digital media (artwork)
duo
fangs
female
female muzan
grey background
grey skin
greyscale
kimetsu no yaiba
kokushibo
looking at another
looking down
lying
male
master and servant
medium breasts
michikatsu tsugikuni
mostly nude
muscular male
muzan kibutsuji
nipples
nude
nude female
pants
red eyes
simple background
sitting
spread legs
watermark
yellow eyes