Sid, inflamed by the unabashed lust all around him, tore off his clothes, throwing them helter-skelter in a careless heap. He strode over to where June was hunched down on all fours, and kneeling down behind her, wrapped his arms around her, kneading her breasts until the nipples were like marbles. She seemed only vaguely aware of his presence and he began to absently bite a path of hard kisses down her spine, the knobs of which were like red-hot firebrands burning into his chest. He could feel the coolness of her soft white buttock mounds against his cock and he pressed his swollen member into the moist valley between the twin loaves. His hands roamed over her body, caressing the smooth flesh squeezing her tender thighs. And with a snarl, he drew her back towards him his hands digging into her hips. She kept her eyes transfixed on her sister, seemingly obvious to the unnatural penetration about to be perpetrated on her.
He kneaded the fleshy mounds of her well-formed buttocks, pulling and pushing at them, spreading them wide, exposing the crack to his crazed gaze. Dissatisfied with her pose, he roughly pushed her head down until it was flat on the rug, facing the wildly twitching couple on the floor nearby, her backside waving unnaturally in the air.
Then, with one hand holding his distended cock, he spread her ass cheeks wide with the other and lodged his cock between the straining moons of flesh. He could see the small puckered ring of her anus nestling in the hidden valley, dark and crinkly against the white of her ass. His thick cock prying the protective ass cheeks apart, Sid began to probe at the little brown hole with his fingertip, the novel sensation raising a ridge of hair on June's back. He began to push more insistently at the tight elastic ring, until finally the tip of his finger plopped inside the tight restricting sphincter.
"Nnnngg…" June moaned but made no move to stop him.
He began to rotate around in the skin-tight passage, wringing gasps of pleasure from June, who though completely engrossed in the fucking her sister was receiving, was not oblivious to her own pleasure. His finger pushed and pulled, trying desperately to widen the tight anus. After a moment, he managed to insert just the very tip of a second finger inside the now slightly moistened channel and waiting a moment until the initial shock of the thicker entry had passed, he continued to expand the defenseless sheath for the perverted assault to come.
He could feel June quivering under his touch, his probing fingers sending forbidden chills slipping almost surreptitiously through her. He withdrew his fingers with a slight popping noise and June gasped in disappointment.
Then, once more clutching an ample mound of buttock flesh in each hard and spreading them very far apart, he bared the darkened crack completely. He could see the little anal opening pulsating faintly, the wrinkled brown skin tremulous in anticipation. He placed the large bulbous blood filled head of his cock against the tiny ring, secretly wondering how he'd ever managed to penetrate it.
June felt the light pushing of the giant knob against her rectum and for a brief moment she almost wanted to stop what was about to happen. But wisps of forbidden pleasure tickled at her and the engulfing flames of lust that were fed by the sight being fucked out of her mind had to be quenched.
Sid pressed the shaft against the minute opening and with a hard lunge, surged forward, only to have nothing happen. It wouldn't go in! The memory of the brutal, forceful entry of George's monster in May's tight little pussy that he had witnessed earlier came rushing back vividly, and following his example, he plowed forward violently, the rock-hard head bursting its way past the tight resistant anal ring.
"AAAAAGGGGHHH!" June screamed, but her heartfelt cry was lost in the louder melee set up by her sister, who after teetering on the crest of ecstasy, finally crashed down to fulfillment in a chorus of blood curdling shrieks. Sid watched as George furiously pumped his lewd load into May's madly churning loins, the foamy white liquid already bubbling up and running out of her saturated cunt. His own unnatural entry forgotten momentarily, he watched as George continued to send jet after streaming jet of molten seed deep into May's quavering belly, until they both finally collapsed in a spent, drenched heap on the floor.
As the searing pain in her rectum eased, June ground her teeth in dreaded anticipation of the next assault. She knew she'd gone a bit too far, seemed condescending, even of his lack of social grace earlier. And now she would pay for it! Sid began to push forward, but so tight was the virginal passage, so wide was his prick, that he could barely make headway, and inch by agonizingly slow inch of it disappeared into her asshole by painful degrees. He could feet the smooth rubbery skin inside clinging tenaciously to his advancing cock and his cock actually forced the clinging flesh aside as it went on its way. Finally, after what seemed an eternity, he reached bottom… he had sunk his cock to the hilt in her tightly molded asshole. He could hear her whimpering quietly under his brutal ravagement and somehow, in his maddened perverted state, he the knowledge of her suffering was like an added incitement to further bestiality. He began to slip his cock out, and the return journey was surprisingly easy. He withdrew it until just the head was inside and then rammed forward again, tearing tile raw flesh as he slipped forward.
"Nooooo!!" June gasped. "It hurts, it aaahhh… hurts!"
But Sid continued to fuck in and out, heedless of her anguish, until the passage became easier and June began to relax a little. She began to grind her ass back on the rampaging cock and each backward thrust of her ass seemed to make things easier.
Little tendrils of pleasure began to show themselves like new flowers after the winter and she realized she was beginning to enjoy the rough pillaging of their tutor's sodomizing cock.
She began to buck back harder and harder against his buffeting cock, feeling his balls slap hard against the tender flesh of her cunt down below and in a swift movement, she reached her hand back and clasped the pendant balls in her hand, willing him on to longer, smoother strokes.
"Oh, Sid," she groaned, finally convinced, "ohhh, it's so nice!"
The audience to this perverted scene feasted their lust-glazed eyes on the sodomizing cock, vicariously enjoying all the pleasure-pain of the sadomasochistic act.
Sid enjoyed the feeling of plunging his hardness into her unprotected secret passage, and hearing her depraved cries for more. He had no idea it would feel like this, so tight and hot and damp, and he slashed into her with tong sweeping strokes of his cock, wringing strangled groans of pleasure from her.
May watched Sid's huge cock pummeling into her sister's virgin rectum, heard her rattling cries of delirious pleasure, saw her furiously undulating buttocks pumping back against his bulldozing prick as her full golden pear-like breasts danced and jiggled under her chest.
Oh, God, I wish that were me! she thought enviously as she savored every moment of the disappearance and reappearance of Sid's cock in her sister's forever stretched nether channel.
June rolled and flung her buttocks back against Sid's hard driving cock, wild rapturous feelings of dizzy delight taking hold of her. She knew she was nearing cumming now and all she needed first was to feel Sid's hot searing liquid scorch into her backside and then she too would cum…
Then a crazy chant sounded behind her: "Ccccuuuummminngg!"
Sid's nails were digging like talons into the soft quivering flesh of her curved buttocks and his fucking cock began spewing its burning fire of seminal foam deep into her hungrily milking anus, shooting it far, far up into the soft rubbery depths and then she was too cumming, flailing and tossing like a newly landed fish, sobbing out a lewd incoherent jumble of words as the inner walls of her pussy opened up and a torrent of sex fluid gushed from deep inside her jerking young belly.