Rule34.GG

Regular against surface
anthro
anus
ass
avian
balls
beak
bird
black body
black feathers
blush
bodily fluids
corvid
corvus (genus)
crow
feathers
foreskin
genital fluids
genitals
hi res
humanoid genitalia
humanoid penis
looking at viewer
looking down
looking down at viewer
low-angle view
male
on glass
oscine
passerine
penis
platinumlust
precum
sitting
solo
tail
tail feathers
uncircumcised
worm's-eye view