Rule 34 Dev - 2010s 2017 2boys 3_hearts anthro anthro_only blush_lines boyfriends clothed couple dragon duo furry gay green_body green_skin heart helmet love male male/male male_anthro muscular muscular_male rabbit rg01_(undertale) rg02_(undertale) scalie sfw underkadi undertale undertale_(series) unseen_male_face white_hair yaoi yellow_fur|9327263624