Rule 34 Dev - 2boys armpit armpits big_penis bulge caught caught_in_the_act caught_masturbating dad dad_and_son dialogue dialogue_bubble father father_and_son gay heroic_creativity invincible invincible_(tv_series) male_only mark_grayson nolan_grayson nsfw nude_female_clothed_male nude_male omni-man son speech_bubble yaoi|9227115792