Realistic (ish): It's a blizzard outside, and me, my wife, and our two big, strong German shepherds are on vacation, stuck in our cabin. We're holding hands and French kissing as both of us are knotted by our good boys. We both fall asleep on the plush rug in front of a roaring fire, both still being pumped full of cum.
Unrealistic: I walk out the door of my farmhouse on a beautiful, warm summer morning, coffee in hand, naked. Sun is out, a couple clouds here and there, and no one around for miles. My wife is already outside, also completely naked, taking care of the shepherds. One's knotted her from behind, the other has knotted her mouth. I give her a good morning kiss on the cheek as I pass, but she can only reply "mmmfff!" as her throat is totally filled by one boy's cock. I smile and walk toward the stables. It was my turn to handle the dogs yesterday, after all. Today I'm on stallion duty.
I walk into the stable, where our two stallions greet me with neighs. Chester is first. I give him a kiss on the cheek and a pat on the side, then kneel down to caress his pent-up balls. After a few minutes of kissing and caressing, he's hard as a rock and starting to get antsy. I take him as deep in my throat as I can, letting him fuck my mouth as hard as he wants. He starts to explode inside me, and it's too much for me - his flare bulges my throat as I take him out, where he continues covering my face in hot cum. What didn't make it into my stomach is now dripping off my face and chest. I give him some scratches and an apple for a job well done.
I lead Blackbird out of the stable and over by the fence, where my wife is still patiently waiting for the shepherds' knots to go down. I wipe some of Chester's cum off my face, and use it to lube myself up, bending over to present myself to Blackbird. Blackbird needs no further prompting - he jumps on the fence, and I guide him inside me. It's been less than 12 hours since my wife took care of him last night, but he's already raring to go again. He fucks me hard and deep, his entire cock entering my ass, and his heavy balls slapping me with every thrust. My wife has finally been released from her knotty, furry restraints, and she comes over to kiss me as Blackbird keeps going. Blackbird and I cum at the same time, my belly swelling slightly from the hot flood he fills me with.
As his flare goes down and he relaxes, I move out from under him, covered in horse cum. I grab an apple from the nearby tree and give it to Blackbird, and as I do, I notice that both dogs are already starting to look a little horny again...