Rule 34 Dev - ! 2boys 4koma age_difference bath beard blush body_hair clenched_hand closed_eyes closed_mouth comic curious english_text erection facial_hair father_and_son flaccid from_above from_below from_side graphite_(medium) grecorum greyscale half-closed_eyes half-erect hand_on_another's_penis incest indoors large_penis licking licking_penis looking_at_another looking_at_penis looking_down looking_up male male_focus monochrome multiple_boys muscle nipples nude older_man_and_younger_boy open_eyes open_mouth oral original penis penis_awe penis_grab penis_lick precum pubic_hair puppicream rubber_duck short_hair shota simple_background sitting sitting_on_bathtub size_difference speech_bubble standing surprised testicles toddler tongue tongue_out traditional_media uncensored water wet white_background yaoi|2935640108