"Chickens?"

You say that with clear uncertainty, looking to your twin for any kind of back up, and she can only offer you a wide eyed shrug.

"Okay!" your elder sister says happily, and she turns to go somewhere else in the barn.

"Alright, enjoy!" your dad says with a smile as he walks behind the cow wall. Having apparently made your choice you and Jenny have little option but to follow Betty deeper into the barn.

You find her standing in front of a large wire pen where half a dozen fully morphed chickens are sitting in a circle of nests. Their heads tilt at you and your twin sister. Their beaks are curled into smiles, bright eyes blinking. Chickens were the more simple minded of animals before they morphed, but once they matured they're some of the most intelligent.

"Happy birthday, Jon and Jenny!" says one of the chickens, her winged arms flapping happily. You watch her chest bounce and find your erection returning. Though the birds are covered in white feathers, they have very fine downy feathers on their chests, all the way down to their crotches. The down is so fine it's almost transparent, their warm pink skin showing through as if highlighting their sexual organs. Speaking of exposed breasts and pussies, your big sister is so amazingly naked you aren't sure where to look

"So this is the Egg Collection Pen," she says, opening the gate and walking to the centre of the pen. She sits down on the soft layer of hay bedding the floor and motions for her siblings to follow.

"Why are you naked?" Jenny asks finally, sounding so utterly confused she seems close to tears. You look to her but her eyes are sharp and clear and focused on Betty's bare pussy.

"Okay, sorry sorry, I didn't explain it very well," she starts, turning to one of the excited bird babes who flaps and sits up. The morphed chickens are easy to tell apart thanks to their crests. Each one actually liked to dye or style it in some way which helped with identification. The one with a slicked back red crest, who you remember being called Bibbi, was getting Betty's attention now and was visibly excited. She has larger breasts than all the other chickens and looks incredibly soft, her hips wide and thighs thick and meaty. She spread her legs while squatting as Betty crawls up to her. "Farm chickens need some stimulation in order to lay eggs," she says, reaching for Bibbi's crotch. "Sexual stimulation."

"I'm full of eggs," Bibbi chirped eagerly. She made an odd purring sound as Betty's hand met her hole. You and your twin's eyes widen and you see that the avian anthromorph was actually wet down there, her fine feathers soaked. She was obviously turned on by the naked female form... and you realised you felt the same way about Bibbi. You have some knowledge about chicken anatomy from classes, but you didn't know if they had such a thing as a clitoris. Bibbi seems to have one, or at least something very similar to it, and as your older sister start to rub at her nub the chicken starts to shudder, spreading her legs wider. "Yes! Uhnn!" she cries as her oozing lips start to part. She clucks then and staggers away from Betty a moment, turning as an orgasm twists through her body. You can see her muscular and feminine form under her feathers as they flare and something starts to emerge from her tight pussy. The other chickens watch intently, as do you and your sisters, as the oval coming out of Bibbi's cunt makes her twitch. Shockwaves of pleasure move through her in visible ripples, feathers ruffling. She squeezes her meaty tits with her talonlike hands, head thrown back. The thickest part of the egg is finally pushed out and Bibbie groans with relief as it plops softly onto the hay. She lowers onto it and rubs her swollen lips over the shell, slick juices dribbling out of her and onto the almost football sized egg.

Image source: http://cyancapsule.tumblr.com/post/124606206931/eyo-another-picture-of-the-chicken-gal-i-drew

You hear your twin gasp, and realise she had been holding her breath as she watched the oddly erotic act of a chicken a laying an egg.

"That was pretty hot right?" Betty says with a smile, looking up at you both. She's starts to rub herself as if to confirm her own point and you can only stare dumbly. It's apparent now that your sister has no problems masturbating in front of her younger siblings and tweaks her own nipple. The other chickens murmur, watching the show. Some of them are rubbing their crotches too but seem frustrated that they're not being serviced like Bibbi was.

"Cock?" says Bibbi, rotating on her egg to turn to you. "Can we see your cock please?" You notice she has bright blue eyes and the pleading in her voice sends a thrill though you.

"C'mon, Jon," your sister says breathily, laying back onto the hay, her freckles fading behind her blush. "Birds are very visual creatures. Show them your cock. " Bibbi turns to your twin Jenny, tugging at her overalls.

"You too... let's see your sexy body," says the lusty chicken. You look to your twin and she seems uncertain but she's blushing and squeezing her thighs together. You feel lucky that your erection is hidden beneath the baggy clothes but it's starting to get uncomfortable. Betty moans as she starts to finger herself and neither of you can look away. You both definitely feel overdressed.