Esther's pussy clamped down hard, forcefully pulling her sister in as deep as she could go and latching onto her tightly as she climaxed. Esther felt her balls release their bountiful burden, and then felt Edna's own balls beneath her own do much the same.
"CUUUUUUUUUUUUM!" Esther howled as she did so, her cock erupting with it even as more was pumped into her hungry womb. Her climax felt like it went on forever and ever until finally the jets of seed slowed to a mere dribble and only the faintest twinges of pleasure.
Esther stood, her sister's head parting from her cunt with a wet, sticky sound. She grinned as she looked down at Edna. They definitely looked like sisters again, each of them with similar porn star-ish versions of their original features, each of them with the same trio of huge, heavy tits and equally massive balls. Ever the slutty deviant that Esther had always pegged her for, Edna balls and knockers were bigger than her own, a lot bigger.
But that was where the similarities of their changes ended. Instead of having a big cock growing from the base of her spine and a myriad of tits growing from her bald head, Edna featured both in one. A dickhead now in body as well as mind and attitude. Her face remained, but her head and neck had transformed into a cock. The purple-red head started just above Edna's eyebrows.
"See? I always said you were a dickhead," Esther teased.
Edna giggled in an airheaded fashion, a vacant look in her eyes. "I'm a dickhead!" she said proudly, shivering as the slit atop her skull dribbled with precum, clearing out the remainder of the seed.
"Yup, you're a dickhead, Dickhead!" Esther crooned to her sister-turned-sex-pet. Esther had to admit that maybe all the crap Edna had spewed about clashing of wills and control and dominance might have had something to it after all. The most satisfying thing in Esther's life thus far had been pitting her will against her sister's, seeing if she could coax Edna into accepting Esther's image of herself. It had turned out magnificently.
Esther offered her sister a hand, helping her get to her feet. Edna wrapped her arms around Esther in a hug, pressing their six tits tightly together and making their cum-slicked balls rub up against one another.
The elder sister leaned down, kissing the younger deeply. Edna moaned and quivered, her cock-head erupting with thick jets of seed that covered the both of them. Both sisters enjoyed it, bathed in it, rubbed it over one another and themselves.
Esther broke the kiss and grinned at her pet Dickhead. "Goddess, you're the sexiest thing I've ever seen."
Edna giggled, "Big sister sex-fiend!" she murmured as she ran her tongue up Esther's cheek, swallowing the seed she found there, teasing one of her sister's head-breasts and coming to a stop on her temple where she suckled on something that Esther had not noticed.
It felt just like her cock, only smaller, and as she reached up with a hand she found another one on the opposite side. A pair of curved cocks, always erect, jutting from her temples like a pair of demonic horns. "Sex-fiend!" she replied with a giggle.
"Sex-fiend and Dickhead!" Edna said, giggling as well.
Esther's belly rumbled rather loudly and she recalled why she had trailed after the two Regina girls. "Mmm... as fun as it would be to stay here and cuddle, my dear Dickhead, I'm starving." A grin spread across her face. "The servants should all be on their way home right now, and the cook should have prepared a big dinner to eat whenever we like."
Esther began to help her pet out of the scraps of her torn blouse. "Plus we're probably going to have to cut that skirt off of you. I don't think we'll be able to squeeze it over the top and definitely not down the bottom. So what do you think, sis, should we stop in and say hello to Mommy?"
Edna grinned and nodded rapidly, "Sex-fiend, Dickhead, and Mommy is...?"
Esther placed her arm around her sister's shoulders, "Well, considering all the crap we got our heads filled with at that school, I think Mommy is a dick for sending us there. What do you think?"
"Mmmhmm. Mommy is a dick," Edna agreed.
"A big, sexy, drooling dick..." Esther murmured, her mind already thinking as to what sort of alterations would best suit Estelle as the two transformed sisters waddled home.