Rule 34 Dev - 2018 2boys 2d belt big_penis black_sclera blowjob blush bone cape claws crying crying_with_eyes_open cum cum_in_mouth dialogue drooling ectopenis english_text gay gloves gray_background grey_background hand_on_head hands_on_thighs hoodie humanoid incest ksuriuri long_penis looking_up looking_up_at_partner magic_penis male male_only papyrus_au penis penis_lick precum red_blush red_cape red_eyes red_gloves red_penis sans sans_au sharp_claws sharp_teeth side_view simple_background skeleton solo_focus sucking sweating sweating_profusely talking text underfell underfell_papyrus underfell_sans undertale_(series) undertale_au undertale_fanfiction unseen_male_face yaoi|3340103280