After Ty suckled all the milk out of one breast, Lisa moved him to the other. When that one wss also empty, she laid him down on the bed, expecting him to transform. Instead, he cried, and suddenly Lisa had a second pair of breasts. While that wasn't new to her, usually she had been deciding for herself when to add them. She picked up Ty and let him suckle more, though she was getting tired of it.
After two more breasts were emptied, she laid him down again. He cried, and another pair of breasts appeared on Lisa. "No," she said, "you've had enough, and I'm tired of it. Transform yourself back to an adult."
Ty continued crying. Lisa allowed that to continue for a while, but she got sick of hearing it. She transformed Ty back to his normal form.
"Wow, that was amazing," Ty said, "but I didn't like it when you put me down."
"I was expecting you to transform back," Lisa said, somewhat angrily. "That was interesting at first, but I got tired of it. I thought you'd take the hint."
"Oh!" Ty said. "Sorry! I really had only the mind of an infant! I only cared about being warm and fed. When you put me down, all I wanted was to be held and fed more."
"I don't buy that," Lisa argued. "You used your power to add these two more pairs of breasts to me!"
"I did? My infant mind must have done it, just wanting more." Ty explained. "If you hadn't changed me back, I would have stayed an infant, so thank you for doing that. I remember being happy when you held and nursed me, and unhappy when you set me down, but I didn't really have any other thoughts. I'm sorry if I annoyed you."
"Well, OK. You're forgiven," Lisa said. "What do you want to do now?"
"Well, I'm feeling quite full, and sleepy. Do you mind if we go to bed?"
Lisa said, "That's fine. I think maybe we should get up early, and practice the zig-zag illusion."
Ty frowned a bit in puzzlement. "Practice? Do we need practice? I thought we did it just fine, and I didn't plan to do another performance."
"Oh, no, I don't think we _need_ practice," Lisa said. "I'm still just trying to come up with ideas for moving closer to revealing your powers to my parents. I thought that if they found us in the living room in the morning practicing, that might move things forward. You can still pretend it's an illusion, but if dad sees it up very close, he may start to doubt that explanation."
Lisa added, "On the other hand, if you don't want to do it, or have some different ideas on how to approach it, that's fine with me."
"OK," Ty said. "I don't have any better plan, so let's go for it."
"I'll set my alarm clock for 5:30," Lisa said, and did so. "My parents usually don't go downstairs on the weekend until 7:00, so that will give us plenty of time to prepare."
Ty asked her, "Would you prefer to sleep in human form, or as a mattress topper and/or pillows? Or would you like me to do that?"
"I really enjoy sleeping in those alternate forms, with you. But perhaps you would enjoy trying that tonight."
"OK, I'll be the mattress topper and pillows tonight," Ty said, and moved her normal pillows off the bed. He transformed himself to his mostly-Lisa form, but added a third breast, between the normal pair. Then his body started losing form and definition, turning into a flesh blob, other than his three breasts, which remained unchanged. The blob spread out to the rectangular mattress topper form, and grew fur everywhere but the breasts, which then detached from his main body. The nipples faded, and the breasts started growing, and changing into cotton fabric surrounding feathers. Two became bed pillows, and one became a body pillow.
Lisa picked up the pillows one at a time, and massaged and fluffed them, knowing just how good that would feel to Ty, from her own prior experience as pillows. She turned out the lights and lay down. Apparently Ty wasn't quite ready for sleep, as the body pillow and one of the bed pillows each grew a large cock. She straddled the body pillow, and started riding. She picked up the cockified bed pillow, and started deep-throating it. Before long Ty came, but he remained hard, and she continued until she came. She rolled off him, set down the bed pillow, and rested her head on the other bed pillow. As the cocks shrank away, she wrapped her arms and legs around the body pillow, and went to sleep.