"Katie, I don't want you to die!" said Tiff.
"But the only way to prevent that is to...."
"Yes, that's right." Tiff removed her clothes, starting with her shoes, then socks, shirt, pants, and underwear, as she explained, "We're in an old house. Nobody's going to find us here."
"Tiff, are you sure you want to...?"
"Yes, I'm sure! We're friends and I'm sure you'd do the same thing for me. Besides it'll be, well, a new experience. There are lots of people it'd be worse for my first time to be with than with you..."
They found the bedroom in the house and had sex on the bed.
A male orgasm was certainly a new experience for Katie. Tiff, who hadn't ever had sex before, did it a little clumsily, but knew that Katie didn't care.
"Did I... hurt you?" asked Katie timidly.
"No," replied Tiff. She wasn't even bleeding, and she knew that a hymen was different on different women. Not all would bleed or even have any trouble.
"That's good..." said Katie. "Ooof."
"What's wrong?"
"It's reversing," said Katie. They watched and could see Katie's new equipment shrink back away, returning her to normal.
Katie put her hand to Tiff's belly. "You don't feel pregnant," she said.
"Of course I wouldn't," said Tiff. "Pregnancy doesn't work that fast."
"Maybe," said Katie, "but I think the milk said something about speed."
They went down to the kitchen again and got the milk carton out again. Katie looked the carton over and found the instructions, which explained, "Average pregnancy time is 24 hours. See, it is fast. There may be nothing you can notice yet, but in a few yours you might.