rule 34 4 arms adrian shephard alien amphibian anal anal sex black mesa blackmesajoe artist blue cum blush camo colored cum cum cum string cumshot excessive cum green tongue half life half life opposing force happy heart hi res human humanoid penis interspecies male male only mammal monster multi limb multiple arms one eyed oral orgasm outside penetration penis race race x saliva sex shocktrooper half life soldier spikes teeth unusual cum valve video games yaoi 1903591