Unrealistic, but...
My fantasy would be with a grizzly bear. I'd be trekking through a coniferous forest, only to turn and see one looking directly at me. I sense something strange: this bear has no intention of harming me, and I feel my shoulders relax. I feel at ease, walking towards the bear as well. We stop, standing in front of each other. He licks my right hand, and I pet him with the other. I see a smile; I feel a purring. He proceeds to stand on his hinds legs, and I study his towering figure. Just a foot taller than me, with a powerful ursine figure typically of his species. I notice his large, bulky sheath, velvet soft and housing a vanilla-colored ursine phallus, slightly thicker and a few inches longer than mine. His crotch smells slightly fishy, slightly smoky, slightly cheezy, and as musky as sweaty balls usually are. His hindpaws are strangely humanoid but beautifully shaped, like the feet of a chubby guy. His tops are smooth, his toes are evenly sized, and I am drawn to worship and love this hairy beast for the beauty he is. He approaches, giving me the softest, warmest bear hug I've ever known in my life. I feel my shaft become erect, and he turns to gaze into my eyes. As I gaze back into his, I sense his love for me is overwhelmingly great and equal to my love for him. He slowly licks my face, a gentle scent of lemongrass and pine filling my nostrils. My body caves in to the rush of relaxation I feel after the second lick, and the third one sends me floating to the ground; the warm, gentle spring breeze lowering me to the patch of moss, pine needles, and soft, rich soil. The gentle grizzly lowers himself to the ground and crawls on top of me. We make out for hours; his warm slimy tongue in my mouth and his big juicy lips overlapping mine. His breath smells of pine trees and blueberries. Then we turn up the passion with some frottage; his thick ursine meat rubbing against mine and drooling endless amounts of pre. After coating my cock with his pre, he inches forward and gently rests his musky balls and cock/sheath on my face, free to sniff and lick while enveloping me with his scent. Then he turns to sit so that his asshole and balls are in my face. He farts a little, the purr of his anus inviting me to taste and sniff and explore its textures. Now the bear is yearning for more, and is actively squirting pre on my chest. He bends down and gives me oral, causing me to climax within minutes. Having had his fill of my jizz, he gets up again to let me return the favor. My stomach becomes bottomless, and I savor the flavor and consistency of his seed pouring from his cock. We make out again while he fucks me missionary-style till sunset. He fills me up, squirt after squirt, and the feeling of my frenulum rubbing against his soft, furry underbelly brings me to the edge. We end the night with him using his hind humanoid, beefy, wide bear feet to please me: from a gentle "foot-pawjob" to resting them in my face. As I breathe in to take long whiffs of his musky, corn-chippy feet, he gently nudges my nose with them, curling his toes a little to trap my nose between the beautifully stinky gaps between the toes. We slumber under the starlit night sky; silently eager to repeat it all the very next day...
(would anybody else like somethin' cool to drink?)