Rule 34 - 1:1 1:1 Aspect Ratio 2010s 2016 2boys Animated Skeleton Bigger Dom Bigger Dom Smaller Sub Bigger Male Black Background Black Hair Blue Hoodie Blue Jacket Blue Tongue Clothed Dark Background Ectotongue Fel-fisk Glowing Hooded Jacket Hoodie Humanoid Robot Jacket Larger Male Licking Male Male/male Male Only Mettaton Mettaton Ex One Eye Closed Partially Clothed Partially Nude Pink Eyes Pink Tongue Robot Robot Humanoid Sans Sans (undertale) Skeleton Slippers Small Sub Small Sub Big Dom Smaller Sub Smaller Sub Bigger Dom Soul Soul Sex Sweat Tongue Tongue Out Undead Undertale Undertale (series) Yaoi