2boys, animal_ears, animal_nose, arm_up, artist_name, blush, closed_eyes, comic, furry, furry_male, furry_with_furry, gloves, grass, greyscale, half-closed_eyes, hand_on_another's_chest, hand_on_another's_head, hedgehog, hedgehog_ears, knuckles_the_echidna, looking_at_another, looking_down, lying, male_focus, monochrome, multiple_boys, ocean, on_back, on_stomach, open_mouth, outdoors, simple_background, sitting, sk_rokuro, sonic_(series), sonic_the_hedgehog, speech_bubble, tail, teeth, tongue, water, wet, yaoi