Rule 34 Dev - anthro anthrofied balls breath erection genitals horn humanoid_genitalia humanoid_penis male muscular muscular_anthro muscular_male penis solo jiggydino avatar:_the_last_airbender nickelodeon appa_(avatar) bovid bovine mammal sky_bison 2015 3:4 digital_drawing_(artwork) digital_media_(artwork) flat_colors|7231094885