<3 2017 animal_genitalia animal_penis aroused balls black_fur black_scales chest_tuft claws cloud digital_media_(artwork) dragon equine_penis erection eyes_closed felkin feral fur furred_dragon grass grasslands green_fur green_penis green_stripes green_tongue gwyardon horn knot male medial_ring nitrods open_mouth outside penis raised_tail scales sheath side_view sky smile solo stripes tree tuft white_balls white_fur white_stripes wingless_dragon