Rule34.GG

Regular all fours
animal genitalia
anthro
anus
armadillo
armadillomon
avian
backsack
balls
ballsack
beak
bird
digimon
digimon (species)
dripping
dudebulge
duo
erection
glans
greyscale
hawkmon
humanoid penis
knot
male
mammal
monochrome
musclegut
naughty face
nude
open mouth
pencil (artwork)
penis
penis size difference
perineum
precum
quadruped
raised tail
sheath
signature
size difference
tapering penis
tongue
tongue out
traditional media (artwork)
vein
veiny penis
winged arms
wings
yaoi