Angered by her argument with her boyfriend Mike, Lisa had wanted some time to think alone. She had saddled her black stallion Buck and was now riding him west along a ridgetop. Lisa decided that perhaps some time away from ther male of her species was what she needed, which might be difficult to accomplish beause she was a ravishing 20 year old. She was 5'9" in her stocking feet and tipped the scales at 115 lbs. She had 38" breasts with large pink nipples that tilted up slightly, a rock hard 26" waist and her hips flaired out to 36". Her ass was muscular from plenty of exersize, as were her long shaply legs. Lisa's mind was just as interesting as her body. She had a warm inquisitive curousity about life and applied her prodigous IQ to experience the maximum physical pleasure whenever possible. So there she was, riding her horse at a slow pace, her long thick brown hair just touching Buck's rump and she was taking in the pretty morning. Her full breasts swayed with each step the horse took and her nipples were growing erect from the friction with her flannel shirt. Her cunt was also becoming moist from the rythm of the stallion's steps and Lisa was soon yearning for sexual contact. She unbuttened the top two buttons of her shirt and squeezed the nipple of her right breast. She decided to find a quit place to dismount and pursue physical pleasure undistracted. There was a small shaded pool in a ravine to her left and she trotted down to it, got off of the horse and let him drink. Lisa then took his saddle and bridle off and let him graze. Lisa looked around and deciced that the area was secluded and that nobody was around, so she took off her shirt and wiggled out of her tight dungarees. She ran her hands down her stomach to her cunt and parted the lips, revealing the pink moistness inside. Slipping the index finger of her right hand deep inside, she slowly rubbed her clit with the fingers of her other hand. Yes, she was getting hot indeed! She glanced around to make sure that Buck hadn't wandered too far off to find that he was intently watching her. Lisa walked over to him and scratched him between the ears and he sniffed her breasts. She also noticed the thick black hose of his flacid penis hanging between his legs. Lisa had noticed it several times before and had always wondered . . . Rubbing her hand alond the top of his back, Lisa walked down his left flank to examine his maleness from a closer view. She slowly reached under his belly and ran her fingers down its rubbery length. "My, my, what do we have here?", she wondered aloud. His cock was now fully distended and becoming erect. The effect on Lisa was electric. She dropped to her knees and started slowly pumping him with both hands, wondering how big she could make it get. Bucks jet black cock was now rock hard and Lisa estimated it to be a little over 20" long and she needed to use both hands to encircle it. A drop of slippery ooze appeared from the slit on the end of the bloated cockhead and Lisa stuck out her tongue and licked it off. It tasted a little salty. She licked all around the the bulging head and ran her tounge down his impressive length, then back up to the tip. She parted her lips and pushed a little of the head into her mouth. Her hands resumed their pumping motion and she pushed as much of the prick into her mouth as she could. Bucks massive cock began to throb and Lisa knew what was about to happen. She removed one hand from the animals cock and slipped two fingers up her cunt. Her other hand quickened it's pace. Suddenly a huge blast of cum shot into her mouth. Then another. The hot, white liquid filled her mouth and she took a big swallow but it was filling her mouth faster than she could swallow it. Lisa took the cock tip from her mouth and got a blast of cum in the face and on her bouncing breasts. Her own orgasm peaked as her pussy clamped down on her fingers wiggling within. Buck continued to pump thick globs of cum onto her breasts and stomach. Lisa and her horse shared their orgasms for several more moments before they were spent. Lisa's head was spinning and she sat back to regain her balance. She was literally covered with sticky cum. Buck's cock was growing limp and receeding back into it's sheath and he was grazing on grass again. She slipped into the cool pool of water and rinsed herself off. The clear water felt good and helped her regain her senses. She then got out of the water and stood in the sun to dry and as she was letting the sunlight caress her she pondered her experience. She wondered what made the idea of having sex with a horse so appealing and decided that it was a combination of things. One it was taboo. "Normal" people didn't do those things and the thought of doing something taboo made the act more exciting. Second the mere sight of that enormous black cock excited her. "Too bad I'll never feel that monster slide into my cunt", she thought as she slipped into her blue jeans and shirt. "The size of it would surely put me in the hospital". As she hoisted the saddle onto buck's back she thouuht, "Well, maybe it could be done, if I grease his cock up good and go very slowly . . . "The thought of what she was considering was causing her loins to stir again and she quickly pushed the notion out of her head. "Maybe some day, big guy" Lisa said as she patted Buck's neck and rode off. Lisa had her big black stallion, Buck, where she wanted him; in the riding stall, he was well groomed and she was naked. After her experience with him at the pool, Lisa was determined to pursue her sexual indulgence with this fantasy stud. She closed and bolted the stable doors. The morning sunlight streamed thru the east windows onto the floor casting small hard shadows where it couldn't reach. Lisa's heart was pounding in her chest at the exciting thought of what she was about to attempt: she was going to have her horse fuck her! She strode over to the mount's stall, where he was intently munching a feed bag of oats and crooned into his ear, "Now we'll see if I can take what you've got to give". At that she ran her hands along his flank, reached under his belly and massaged the bulge where his cock would appear. The soft velvety skin felt like it was too sensitive to handle, the whole idea too bizarre to pursue when the head of his cock slid out into her hand. And then she could not turn back. She was no longer a thinking, rational, civilized human being; she was a driven and obsessed individual, not considering the potentially disasterous consequences of what she was about to attempt. Lisa dropped onto her knees transfixed by the sight of the enormous black penis appearing in her hands. It kept sliding out and out until it looked like a small arm in her hands.. She lifted the member to her mouth, parted her lips and took the bulb on the end of the cock into her mouth. She slid her tongue under the head and could feel the animal's cock throb every time his heart took a beat. Lisa's hands began slowly stroking the shaft of the cock and it began to become hard . . . and much, much bigger! Lisa took the cockhead out of her mouth, closed her eyes and rubbed the meaty pole on her face and then her beautiful breasts. She slid the bloated head on her nipples until they became erect. And all the while the cock became bigger and bigger. She got up and got a container of lubricant and whent back to her work. Lisa applied a generous amount to the end of buck's cock and began coating the shaft of the pole. When she had about 12" of his dick lubricated she removed one slick hand and slid 2 of her fingers into her steaming cunt and strummed her clit with her thumb. Lisa slowly rocked back on the wiggling fingers in her cunt and spent several long moments in increasing waves of pleasure. Her left hand was full of a slick black cock of enormous proportions, quickly slipping over the fat head and down its length. And she slid two more fingers of her left hand deep into her cunt. Oh, yeah! It was time for the moment of truth. She got up and led the steed over to a bed which consisted of several stratigacally placed bales of straw covered with a wool blanket. She positioned the horse over the arrangment and slid underneath him. His bulk and it's implied strength seemed a bit overwhelming. Lisa reached down between her knees and grasped the cock of her dreams. She rubbed the bloated head between the lips of her cunt and gasped as Buck hunched up hishind quarters and let loose with a pelvic thrust that easily slid the entire end of his cock past the girl's cunt lips, stretching them to the limit. It was in!