The monster girl trio tried to finally catch the powerful anthro tigress running to her with the strength of all their legs in their new form. After some minutes of chasing the Cerberus girls trapped Wanda in a corner, stretching one of their paws with claws to her, but Wanda stopped and evily smiled at them, making the girls worry about it.
Wanda used all the strength of her four arms to grab their body and laughed wickedly. "HA! Did you really thought you pathetic weak mutants could rival my power?" The Cerberus felt how Wanda used even more her strength to squeeze them, "All of you are product of my transformation, you have no access to this power, I'm a real mutant-X! I'll show you what we are capable of!". The three girls sensed a weird feeling all over their body, watching how the tigress manipulated their form like if it were clay. "You thought it was over? People originally transformed with the mutation liquid X have this power... To manipulate other mutants forms and merge with them!".
Wanda kept playing with the monster dog trio, toying with their form and changing their mass and shape to her own will, assimilating parts of them to her tigress body. She grabbed Cory, Tara and Cindy's head and fused them with her first pair of tits growing one extra breast in the middle for Tara. Then she merged the rest of their dog body with her tigress legs, changing their colour from stripped yellow to fully brown fur to match the dog body. Wanda finished her transformation, now as an amazonian tigress-dog centaur with the three girls as her tits, replacing their mouths with nipples that dripped milk every time they tried to talk, being able to only talk with the heads on the cocks of the dog body, Wanda kept the two cocks in her original frontal legs.
The new tigress mutant laughed again "and you thought you could catch me!" She squeezed her three breasts making them squirt milk, admiring how the muscles in her four arms got bigger with the extra mass she absorbed making her grow to 16 ft tall, now she could run really fast using her eight-legged dog lower body. "God this feel sooooo amazing, mom would be really proud of me" she giggled, ready to spread her chaos again.