Rule34.GG

Regular 2boys
alien
autobot
blue eyes
cannon
cybertronian
duo
erection
hi res
hound (transformers)
humanoid
invisible
living machine
machine
male
male only
male penetrated
male penetrating
mirage (transformers)
nude
open mouth
penetration
penis
ranged weapon
riding
robot
sex
sitting
traditional media (artwork)
transformers
weapon
wheels
yaoi