Lisa didn't say anything, but she quickly undressed, then made two copies of herself, which startled Ty. The three of her quickly pulled his clothes off. One of her shoved the pillows off her bead, and transformed into her now-common mattress topper form. One of her added more arms, breasts, and pussies to herself, grabbed Ty, pulled him onto her mattress topper self, and started making out with him. He quickly transformed himself, to have a cock for each of her pussies.
"What's the other you doing?" he asked, but was answered only by feeling her cock push it's way into his anus. "Oooh!" he squealed, not having expected that."Well, if that's the way you're going to be!" He gave himself two more cocks, much longer, and made them prehensile. Each of his new cocks found its way to the anuses of one of her two mostly human bodies, and it was her turn to squeal.
After they'd fucked each other(s) senseless, they stood, Lisa merged herselves back together, and they both transformed to their normal human forms.
"Let's go to your bed," she said. Ty wasn't sure why she wanted that, but was happy to do whatever she asked. "You agreed not to change my house without permission, but I don't think your parents mind when you make changes to your room. You said you made it much bigger, when you were trying out supercomputers to rescue me."
"That's right," Ty said, not sure where this was going.