"Before I take a turn," Ty said, "I want you to try again, but with the mental changes you prefer. But only if you let me take away some of your abilities."
"Take away my abilities?" Lisa asked, concerned. "Why?"
"It's for your safety, and if all goes well, you'll never miss it," Ty explained. "The issue is your ability to change yourself. For quite a while now, you've had the ability to undo or redo any transformation that I've previously done to you. That seemed like a good idea when I gave you that ability, and it has mostly worked out well."
"Right," said Lisa. "But it caused trouble when, in my altered mental state, I worked against you turning me back to normal. I'll be sad to lose that ability, but I agree that your taking it away is for the best."
"No, I'm not taking it away," said Ty. "Not completely. I'm going to change it so that you don't have the power to transform yourself, when I'm trying to transform you to your normal human form. Under any other conditions, you'll still be able to do it. And one other restriction. You won't be able to undo this change, to get back the ability to fight the transformation back to normal human form."
"Oh!" exclaimed Lisa. "That's a great solution! I'm glad that you won't have to take away my general ability to undo and redo the transformations, because I've really enjoyed being able to do that."
"Right! So are you ready to be my cock again? With the mental change?"
"Go for it!" she said, very enthusiastically. And this time Ty was excited about it too.
"I'm making the restriction to your ability... now."
Lisa confirmed, "I felt a change. To test it, I'll try turning into a pillow, and I'll try to prevent you turning me back. But in case it doesn't work, I'll only resist for a few seconds at most." She sat on the bed, and transformed herself into a body pillow.
Ty picked her up, and squeezed and rolled her a bit, which she should find pleasureable. He set her down, then tried to transform her back to human, and it worked instantly. He asked, "Were you trying to block me? I didn't sense any resistance."
"Yes," Lisa confirmed. "As soon as I was a pillow, I started concentrating on keeping that form. I enjoyed your handling me, but right after you set me down, I could tell that I was no longer able to hold my form."
Without any further ado, Ty transformed her into his cock again, allowing the accompanying mental changes, although he was sure to make those temporary. Then he split his cock (Lisa) in two again, made them larger, and started jacking off. As excited as he was, it took some serious effort to not just orgasm immediately. He kept stroking both of his cocks, thinking about how much Lisa, no, the Lisa's, must be enjoying it.
After he came, he was going to merge his cocks back together, as before, but then had a better idea. He transformed one cock back into Lisa's normal form, leaving himself with one cock.
"Mmmm, that was awesome," Lisa said.
"And you're Lisa again?" he asked.
"Yes. As Cock, I had the same feeling when you started transforming me back, and as before, I didn't like it and tried to resist. But I could tell that I no longer had the ability to resist."
"That's a relief," Ty said. "And you didn't immediately want to transform back into Cock?"
"No. Well, I mean, yes, sort of. I want to do it again, but with my mind back, I know I can't just stay as Cock all the time."
"Hmmm," Ty pondered. "What if you could?"
"Ty, what do you mean? I don't seriously want to do that!"
"Oh, just speculation. I'll explain later. But tell me," he asked, "did you feel anything unusual this time?"
"Yes, now that you mention it. I thought I felt the splitting sensation, from when you split your cock, and me, in two before. But I never felt the merging sensation, and I don't have two memories of being masturbated, so I must be mistaken."
Ty smiled, and said, "Now, if you don't mind, I'd like to have sex, with our bodies just as they are now."
"OK," said Lisa, "though I'm so used to our doing it in unusual forms, that I'm surprised that you don't want any transformations."
"I love you in every form, Lisa. Your body was perfect even before we started changing it." Lisa smiled, as she mounted him, cowgirl style.
Afterward, Ty said, "That was great! Now, if you don't mind indulging me, I'd like to make love again, but this time I want to have the pussy,
and for you to have the cock." They each transformed themselves, and fucked again.
"I'm getting tired," Ty said when they finished, "but would you mind being my cock again for a while? I'll jerk off, and maybe sleep a while, then turn you back."
"Sounds great," Lisa said. "And you said you thought _I_ was insatiable!" She smiled.
Ty turned his pussy back into a cock, and then transformed Lisa back into his second cock.