Diego sat down, and said, "Maria and I will watch TV for a while. You're welcome to stay here with us, but you don't have to."
"Thanks, Dad," Lisa said. "Ty and I will go to my room."
"Since it's not a school night, you can stay up late, but make sure Ty heads home before his parents get worried."
"Right, Dad," Lisa said, and Ty followed her to her room. Ty locked the door, and set up the one-way soundproofing.
"So you had The Boyfriend Talk," Lisa said. "How'd it go?"
"It was awkward for me," Ty answered, "but it went fine. I learned something interesting, that maybe they hadn't told you."
"Oh, what's that?"
"Your dad brought up that they had given you The Talk, and that they didn't expect you to be abstinent," Ty said.
Lisa interrupted. "Yes, yes, I told you that."
"But maybe you're not aware of the next part. He said that it would be hypocritical to allow you to have sex, but not in this house. He said it was fine for us to have sex here, as long as we're not conspicuous about it." He explained the details about noise, clothing, interruptions, and emergencies.
"Oh! You're right!" Lisa exclaimed. "That is new. I wonder why they didn't tell me before?"
"Maybe they just hadn't considered it before. Anyhow, it's great to have official sanction, and as long as I remember to do the one-way soundproofing, we can make as much noise as we want. If someone knocks on your door, I'll have to remember to turn that off, so we can reply."
"OK," said Lisa. "Now let's turn our bodies back. I'm going to have four cocks this time, so you'd better have four pussies!"
""Sounds good!", Ty replied, and they each started transforming themselves. Lisa's hips and crotch widened, and her pussy turned into a large cock, which then split into four and grew more. She grew two more arms and two more breasts, with pussies instead of nipples, and a zipper and a long tongue in each. She started zipping and unzipping her breast pussies, and while they were open, licking each of her cocks with tongues from them. Ty found it fascinating to watch, as he did his own transformations, and said, "I don't think you actually need me."
"Oh yes I do," she replied archly. "Haven't you got those pussies yet?"
"Working on it," he said, and concentrated even more. His body transformed into a copy of Lisa's four-arm four-breast four-pussy body, including the breast pussies, and all of the zippers and tongues, even the one in his womb. But then he retracted the tongues from his breasts, and the breast pussies went away leaving his breasts with neither pussies nor nipples.
"That's bizarre," said Lisa, "Why did you get rid of your breast pussies? Don't you at least want nipples, then?"
"Good question," said Ty. He continued concentrating, and each breast grew a large cock where the pussies had been, and the nipples before those.
"Ooh, neat!" said Lisa, stroking her cocks even faster and harder with her breast pussy tongues.
Not to be outdone, Ty tried to unzip his pussies, Not having had the zippers before, it was a bit of a challenge at first, just as it originally was for Lisa. He got the hang of it, and when he had them unzipped, he extended his pussy tongues and started stroking his breast cocks with them.
"I see where this is going," Lisa said. "Give me a moment." She increased her masturbation even more.
"Take your time," Ty said, "I'm going to need a couple of minutes. I'm not yet as dexterous with the tongues as you are." He sped up his masturbation as well. And then thought to zip his mouth. This is bizarre, he thought, as he tried to open his mouth, but could only part his lips slightly, revealing his mouth zipper to Lisa.
Lisa zipped her mouth as well, and they kissed awkwardly with their zippered mouths. Then she opened her mouth zipper, stuck her tongue between his lips, and started licking his mouth zipper, while they both continued to masturbate furiously. Ty moaned, the sound muffled by the mouth zipper.
Lisa and Ty both came at almost the same time, shooting thick ropes of semen in eight directions.
Ty opened his mouth zipper, and said, "I've got an idea!" He concentrated, and flipped his mouth zipper over, so that the pull was at the other end. He pressed his lips against hers, in such a way that their zippers touched, and then he zipped the lower half of her mouth zipper to what had formerly been the upper half of his.
"Wow," she tried to say, and he could feel their zippers and lips vibrating. He unzipped them again, so that they could separate their heads. "That was wild," she said.
"Ready to fuck," he asked. She didn't reply, but lined up her cocks with his pussies, and slowly started thrusting, while he lined up his breast cocks with her breast pussies. Even with only soft, slow strokes, the sensations they each got from their own four cocks and four pussies were off the scale. They started stroking just a little harder and faster, and soon both rolled their eyes back as they had incredibly powerful simultaneous male and female orgasms.
They quietly held each other, enjoying the afterglow.
After a while, Lisa said, "We spoke about my protection, but not about yours."
Ty said, "Except for the very first time I transformed to have most of your body, every time I've given myself female organs, I have made sure that I can't ovulate. And that first time, neither of us ejaculated into my pussy."
"Oh, that's a relief. Thank you, Ty."
Ty asked, "Say, do you have any marbles? Or walnuts? I want to try some of your tricks."
"No, and no," Lisa said sadly.