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You keep watching the video. There is now a close up of the terrier eating out the mare and you can see the outer folds of her vagina being moved around by the motion of his tongue. He begins pushing his snout deeper into her slit, until he takes a deep breath and buries it all the way, effectively snout-fucking the mare. The camera cuts to the mare's face and you can see her eyes are rolling back from pleasure and her tits are swinging as she fucks herself on the terrier's face.

She nickers and pushes back hard on the terrier as the scene flips back to the close up of her now dripping vagina. With a final thrust, her cunt explodes on his face and he backs out slowly, licking furiously to taste all of her juices. The scene backs out and you can see his sloppy muzzle dripping onto the floor. He scoops some of the juices off of his face and rubs it on his fully extended, veiny red cock.

You look at Fred and catch him watching you more than the video. He quickly looks back and works the length of his shaft while pretending he wasn't watching you. Your own cock is so hard it hurts, but you don't want to cum yet so you slow down your strokes.