16:9
2016
3d_(artwork)
3d_animation
animated
animated_gif
anthro
balls
butt
darksorm
detailed_background
digital_media_(artwork)
echidna
erection
genitals
knuckles_the_echidna
male
mammal
monotreme
nude
penis
sega
short_playtime
solo
sonic_the_hedgehog_(series)
tail
tail_motion
tailwag
widescreen
