"Damn bastard's gonna come," Biff muttered, still jerking himself off.
He was right. Gail's sobs turned to cries of joy as she felt her pet's cum blasting into her orgasming pussy.
Scotty gave one final fuck-thrust into his mistress' cunt and held his prick there, hosing her cunt walls thoroughly with his rich cum.
"Good, good, Scotty! You're coming inside me really hard now, lover! It feels great!" Gail gurgled, beside herself with excitement and pleasure.
More and more dog-cum jetted into the youngster's pussy until it finally backed up and began to run out of her. The thick dog-cum mingled with her own girl-cum, and the lewd mixture ran down her thighs, pooling onto the bedclothes below.
"Jesus, what a sight," Biff said, shaking his head.
His own hard-on throbbed in his hand and he knew that he was going to come in a matter of minutes, too.
Finally, Gail's orgasm ended. She knew that her dog had shot his cum-load into her. There was no more cum left in his balls. With a sad little sigh, she fell forward, resting her weight on her shoulders. Her ass was still poised high in the air, her dog's prick still inside her twitching pussy. Her naked flesh was soaked with sweat and her mouth was curved into a smile of satisfaction.
Biff handled his rock-hard cock in both hands now. He stared at his sexy sister with a slack jaw, and drool oozed from the corners of his mouth.
Scotty gave a little whine as he pulled his cock out of his mistress' dripping pussy. He moved around in front of the young girl and flopped down on his back, his furry paws pawing at the air, and his tail wagging furiously.
"Oh, Scotty, your cock's still hard!" Gail cried excitedly.
She reached out and stroked the dog's furry belly, moving her hand toward his upright prick.
"God, doesn't he ever quit?" Biff muttered. But he grinned as he moved behind his sister, his eyes on her wriggling ass and cum-soaked cunt.
Gail moaned a little as she grasped her dog's cock and rubbed it hard.
Scotty panted hard and whined with pleasure.
The animal's stiff prick was jutting straight up in the air, only an inch or so from Gail's parted lips.
Biff knelt between his little sister's thighs. His own stiff cock poked lewdly between her legs.
Gail groaned as she felt her brother's spongy cockhead banging up against her pussy.
"You want me to fuck you, Sis?" Biff asked hoarsely.
"God, yes, fuck me hard! I'll take care of Scotty's cock while you take care of my pussy, Biff!" Gail chirped.
She arched her back more and the wet slit of her little pussy rose higher. Biff aimed his big prick against her cunt. As she humped her ass back against his crotch, he suddenly lunged forward. With one hard thrust, Biff fucked his entire pulsating prick into the hot juiciness of Gail's tight cunt.
"Argh, yeah, Biff, yeah! Your hard cock feels soooo good inside me!" Gail cried. She eagerly humped back against him, her asscheeks wriggling.
As she fucked with her brother, Gail lowered her head toward Scotty's prick. She felt the dog's cockhead against her lips and she moaned with heady anticipation. She opened her lips wide and sucked the flared cocktip into her mouth. She licked up the delicious pre-cum, murmuring little love words to her pet.
Scotty yelped with excitement, his body shuddering as his mistress sucked on his prick.
Gail ran her hot, wet mouth over the dog's entire cockshaft while he twisted about on the floor. She sucked his cock into her mouth as far as possible, nibbling on the sides of the pulsating prickmeat.
Meanwhile, Biff fucked his cock in and out of his sister's cunt, rubbing it hard against her clit with each inward stroke.
"Ohhhh, Biff, keep fucking me hard like that! God, but it feels great!" the young girl cried, popping the dog-cock out of her mouth just long enough to yell out her pleasure.
Scotty whimpered impatiently, looking up at his mistress with wide, pleading eyes.
"Ohhhh, Scotty, I'm so sorry! I didn't mean to stop sucking your cock," Gail whined. And she immediately lowered her head again, sucking the dog-cock back into her mouth.
Biff dug his fingers in the silkiness of his sister's ass. He shoved his hard cock wildly into her wide-open pussy. Over and over, he savagely fucked his long, thick prick deeply into the tight grip of his sister's wet pussy.
Gail clenched and unclenched her tight cunt muscles, making her brother groan with lust as he continued to ram her fuck-hole with his huge cock.
Gail was sucking more and more of her dog's cock down her throat. Scotty raised his head and licked every part of the young girl which he could reach with his long, pink tongue. Gail shivered with delight, feeling the animal's rough taster running over her naked flesh.
Gail felt Scotty's dog-cock strike the back of her throat, and she eagerly began to deep-throat him. She swallowed hard, feeling his satiny cockhead slide easily down her throat. She sucked and sucked some more, swallowing hard. She was forcing more and more of the delicious dog-cock down her throat. Already, she was looking forward to the feel of his cum filling her mouth and shooting down into her belly.
After the girl had swallowed so much of Scotty's prick that her nose was pressing about his loaded balls and her lips were brushing his prick sheath, she began to tense and then relax her throat muscles, giving the dog the best blow-job possible.
Scotty yipped and panted raggedly. His mouth was hanging open and his dog-drool was spilling from it, matting his fur and wetting Gail's skin where he continued to lick her from time to time.
As Gail continued to suck hard on her dog's cock, deep-throating him, Scotty raised the upper part of his body as much as he could, managing to reach the girl's tits. Gail felt his tongue licking at her nipples, and she shivered. Those tongue-licks seemed to increase in intensity with each jolt of bestial pleasure Gail gave his dog-cock with her tightening throat.
She winced with pleasure as her pet continued to lick her nipples. She kept clenching and unclenching her throat muscles around the Irish terrier's stiff prick. At the same time, she tightened and loosened her cunt muscles around her brother's big cock.
Biff's prick twitched and jerked and he knew that he was about to come. He could feel his sister's demanding cunt muscles working on his savagely pumping prickshaft, trying to milk the cum from his balls.
Over and over, the young boy fucked his cock deeply into her tight, squeezing pussy hole. He could hear the wet, slurping sounds Gail was making as she sucked hard on Scotty's prick.
Biff groaned with excitement at the idea that his little sister was sucking a dog off while he fucked her dog-style.
"Suck that bastard's cock, Gail," he suddenly yelled. "I'm coming, you dog-slut!"
The hot cum exploded from his prick, shooting in a thick gusher up Gail's twitching pussy hole. Biff continued to hump his ass, grinding his cock into the youngster as wad after wad of his hot jism filled her pussy.
He dug his fingers painfully into Gail's firm ass, feeling the last of his cum spurting from his jerking prick. Finally, his cock went limp and he pulled out of her with a wet, obscene sound.
Feeling her brother's jism filling her little pussy thrilled Gail beyond belief, and she began to come. She tightened her mouth and throat even more around Scotty's cock, and the dog yelped in surprise and pleasure.
Gail gurgled around the stiff prick in her mouth as she came hard. She felt weak with lust and ecstasy as gigantic shock waves of climax washed over her, leaving her whole body trembling like a leaf.
Suddenly, she felt Scotty's dog-cock jerk violently against the walls of her throat. She groaned with excitement, knowing that she was about to receive a huge load of dog-cum in her mouth. She could hardly wait, she was so excited.
She continued to work her strong throat muscles around Scotty's bucking prick. Even though Biff's cock had felt good in her pussy and had made her come, Gail was glad that it was no longer inside her. Now, she could turn her full attention to her dog who was, after all, her most favorite lover in the whole world.
Scotty's body lurched up from the floor, then crashed back down. His eyes glazed over and he let out a series of long, wailing howls as he prepared to come.
Just then, a thick, hot gusher of dog-jism shot from his large cock-knob and splashed directly into Gail's throat. It was immediately followed by another spurt of cum, and then another. Glob after glob of the thick, creamy goo was propelled violently from the dog's cock and slid down Gail's clenching throat.
"Way to go, Sis!" Biff cheered from the sidelines. He reached beneath his little sister's chest and stroked her tits while the young girl continued to swallow her pet's dog-jism.
Gail felt her own juices pouring out of her pussy and running down her legs. She knew that her bedclothes would be stained with cum and pussy juice by the end of this torrid three-way fuck, but she didn't care. In fact, that knowledge only turned her on more, and she swallowed Scotty's cum even more greedily.
Gail came again as she drank the last of her dog's jism. She slipped Scotty's softening prick out of her mouth and fell over onto her back, grinning with satisfaction.
"That was fantastic!" she said, her eyes on Scotty.
The dog lay next to her, putting his furry head across one thigh. She reached out and stroked his head, almost forgetting that her brother was there.
"You little slut!" Biff growled.
But then he laughed and Gail joined in, the sounds of their mutual merriment mingling with Scotty's excited barks.