5:4
anthro
ball_gag
balls
bat
bdsm
bondage
bound
digital_media_(artwork)
duo
echidna
gag
genitals
hi_res
knuckles_the_echidna
latex
male
male_penetrated
mammal
monotreme
mot
penetration
penis
rouge_the_bat
sega
sonic_the_hedgehog_(series)
transformation
