Molly couldn’t understand what was happening. She went upstairs to her room to try and relax. Maybe it was how overwhelming her sisters and her mom were being. Still, why did Carol have… that big thing in her crotch? The more she thought about it, the worse her sensation on her own crotch felt, and she could still feel something pushing her mouth.
Since she was more concentrated on those two aspects, Molly didn’t notice that her body was growing. Her bigger feet looked more like hands now, with a gray skin tone and a coarse texture. Grayish hair began to grow on her calves, gaining mass too, and the changes moved upwards to her buttocks. While hair continued to grow into her torso, mass was still stuck below. She had grown from 4 feet up to 5’10”. “Huh?” was all she said, noticing a deeper, stronger voice.
Something pushed forwards in her pelvis, and that something, along with her waist growth, tore apart her panties, revealing a growing penis. Molly sat on the floor, also tearing apart his dressing gown with his body movement, as his torso had also expanded significantly. Molly’s head, relatively unchanged aside from the jaw elongating outwards, rested on the body of a great gorilla.
“This…” he moved his bulky hand to his ever-growing member, “is this what Carol had?” The gorilla grabbed it and felt pleasure, continuing the transformation in his face as his forehead narrowed, his eyebrows pushed outwards, his nose flattened, his mandible finished elongating and his teeth reshaped with longer canines. His breathing was getting heavier, stroking his member now with his two feet as he was feeling his new thick and dark coat of fur across his body. Beneath that fur, his skin was grey, like that of his limbs. He grunted, feeling two balls popping in his scrotum. He climaxed once the penis and his testicles finished growing into a size much larger than Carol’s.
As the gorilla stood up, he looked across the room, recognizing it as his, even though it was too small for comfort. He tried climbing into bed, but after hearing some cracks beneath the mattress he thought it would be best to leave it for now. He opened the closet and huffed, seeing that none would come close to fitting him. He looked in the mirror, and even after vividly going through the transformation, nothing felt out of place. He was much stronger now, the strongest in the family if his erect shaft was anything to go by. After this examination, he opened the door to go out, struggling to fit through the frame.
Carol and Allison could feel some stomps coming from the stairs. When the two went there they saw a big gorilla knuckle-walking towards them. Allison let out a snort in confusion, and Carol asked if that was Martha. The gorilla nodded side to side, using hand gestures to say that he was Molly, putting his hand on Carol’s waist, which was Molly’s previous size. He also abruptly pulled down Carol’s pants, uncovering her genitalia. The gorilla stood in his two feet and signaled his own crotch, both Allison and Carol being surprised by its size even in a flaccid state.
Molly, like Allison, was able to muster some words, and after saying he was “bigger,” he asked for their mother.