Any animal on human anal, best of all of it's a genuinely hard horse cock or a big dog knotting a tight human asshole, esp. if the human is vocal... the more cum that gushes out afterward the better
Humans getting knotted deep, like really tied, & getting to see the dog's balls and asshole throb as he dumps a big hot load into his bitch
Bondage + bestiality + rape play = varmint cums hard & fast (ed. for clarification: that's a human in bondage pretending that the animal is raping them)
Pigs cumming in a human so much it comes squirting back out as his giant balls throb & he shoots more & more & more
I want so bad for that to be me beneath him
Doggy DP, no matter what holes are involved! Rare but satisfying