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Rule34
imageboard
2016
balls
blush
duo
english text
fan character
gay-albino-robot
girly
hair
heart
humanoid
machine
male
mettafell
mettaton
mettaton neo
multi arm
multi eye
multi limb
multiple gentitals
penis
robot
selfcest
sex
sharp teeth
simple background
smile
square crossover
teeth
text
underfell
undertale
undertale fanfiction
video games
white background
yaoi