Mary went to pull out of her parents, but found herself unable to. Curiously, she looked down at her crotch and saw that her legs had completely merged with her parent's legs. Mary let out a yelp upon seeing her continuing changes, causing her parents to look back over
“Whats wrong honey?”
“Did something happen?” Her parents asked in sequence.
“Our legs, they've merged together!” Mary shouted back.
“Oh, so they have.” Robert replied, apparently less worried about this development than Mary was.
“Is that a bad thing though?” Melissa questioned
“Me and Robert merged together and we're happy as can be, you joining us is even better!” She continued, getting excited at the idea. Her parents complete lack of panic actually helped Mary calm down, her entire life had been upended the moment her parents became a two headed dragoness, so why should one more layer of craziness make any difference? Deciding that her parents lackadaisical attitude to what was happening was the correct way to handle this, Mary resigned herself to simply accept whatever might happen next. Seemingly reacting to her change of attitude, her changes continue, her torso moving forwards along her parents back, leaving their now much thicker merged legs behind. While their daughters torso continued to move towards their shoulders, Melissa and Roberts arms morph into a pair of forelegs and their spine shifts, leaving them locked into a quadrupedal stance. When Mary reaches the front of her parents body, their shoulders expand, Melissa and Roberts heads separating to make room for Mary's torso. Finally a Mary's cock, now nearly two feet long, and her now basketball sized nuts emerge from between their back legs.
The three of them were now fused into a single body, Mary soon realized that despite the fact that she appeared to be the dominant member of their tauric form, she had no control of the lower torso. Melissa and Robert, despite appearing to be a pair of dragon heads attached to their daughters body, had shared control over the entire lower torso, meaning that they were fully in charge of where the three of them went, though Mary was the only one with working hands. After the realization of who controlled what in their new body the trio ponder what to do next.