Rule 34 Dev - 2boys 6_eyes abs anal anal_sex bar_censor birthmark blushing brothers crying crying_with_eyes_open demon demon_boy demon_slayer earrings erection eye_symbol facial_markings fangs gay half-dressed hand_on_leg hand_on_thigh incest japanese_clothes kimetsu_no_yaiba kokushibo leg_lift long_hair male male_only michikatsu_tsugikuni monochrome multi_eye muscles muscular muscular_male nipples open_clothes partially_clothed penis ponytail ponytail_male sex siblings twins twitch_lines twitching upper_moon veiny_penis visible_breath yaoi yoriichi_tsugikuni|5565816872