Meanwhile, back at the house, steam was certainly being blown off by the family. The conjoined quartet of Melissa, Robert, Jenny, and Mary were pounding hard into Mark with their twin cocks, the sole remaining member of the original blood family being motorboated by the quartet of tits on their lower body. A grand chorus of ecstasy was given from all five as the cocks double stuffed the single vagina of Mark, forming a lewd song with the 'beats' of every thrust of hip into hip and balls into balls.
The most recent orgasm rapidly approached, flooding into Mark's womb, the many gallons produced by the gargantuan spheres bloating out her belly. From Mark's own cock came a tidal wave of cum that coated yet more of the floor, that which hadn't been covered by earlier activity at least. One each of Melissa and Robert's paired off to makeout as it came at the same moment Jenny and Mary locked lips in slightly awkward but still pleasurable fashion, the remaining heads reaching the zenith of the chorus.
The wind down would only prove momentary, though. As Mark pulled herself off the twin cocks, cum leaking from her pussy, she made her way around to the back of the quartet's body to thrust her own spire into one of the two vaginas, the most recently manifested one that she still had not shot her load into.
"Y-you- Ah!" Jenny tried to began as she broke the kiss, but, unused to pleasure, had her words broken away.
"Should join us~" Mary continued, lightly reading her sister's mind, before being interrupted with a moan of her own.
"Guh~ If-" Mark moaned out, as the four heads of their parents fought over the nipples of the reaching-her-knees large breasts that were resting on the conjoined dragontaur's lower back. "If I do...we can't fell *Gah* this pleasure like this again!"
The five scream out in orgasm as they once more peaked, aided by the sheer lust all felt already. Now it was the tauric body that was growing bloated with cum, more than prior at least. Mary managed to fight through it, barely, to have one arm slap down and search through the bowl of candies, taking a couple attempts to find the one she needed.
"J-joint of...*moan*...you know...*uh* where the upper body and lower body of our *groan* tauric body meet~" she gasped out.
Melissa and Robert caught on near instantly. "You want us...*oh gods*...to have two lower bodies!?"
"That sounds amazing!" all four of her relatives exclaimed.
Mark near leapt at the chance, cock still shooting a bit of cum out as her orgasm wasn't entirely done at the moment. And yet, the promise of what could happen...it was too tempting. Drawing close, it wasn't certain whether she stole it from the quartet's hands or she was given it, so great was the eagerness of the five's blissed out minds.
The transformation came quick. Mark was drawn in, neck first, only so far that her body lined up with the hips of the taur where her collarbone formerly was. The lower body remained separate, though underwent a few changes, ones that were partly mirrored on the original lower body.
Cocks grew out, as did balls, the massive spires and cum factories both being larger than before and also becoming three cocks and three pairs of cum factories, or would it be cum reactors at this point, each upon both lower bodies. Not to be left out, there would be a total of three pairs of pussies between their haunches, ones that would grow out greatly in size. The same would prove true of the breasts, them like the balls reaching such a size that they would drag against the ground. Yet there would be no pain thanks to the strength of draconic scale, and in fact there would be pleasure for all of the now quintet whenever they moved
Even without the fact that these breasts would be titfucking all three of the cocks due to their positions.
Mark's arms would migrate up to the upper body of the now double-taured body as this occured, finding a place to just below Jenny's own pair of arms. A new pair of breasts would grow upon the upper torso, just like the arms below Jenny's added pair, at the same moment as, next to Mary's head, Mark's own head grew out.
Throughout the transformation, pleasure roared through the quintet's minds, feeding off of each other. It was no surprise when orgasm after orgasm proceeded to crash into the body the family had made of themselves, each losing track of who was kissing who as they had.