"I was going to ask you the same question," Phineas said. "Although, I would have worded it as: Isabella, will you be my girlfriend?"

Isabella went to Phineasland. This time, Phineas noticed.

"Isabella? Snap out of it!" he said.

Isabella was broken out of her trance. "Sorry. Must have dropped off to Phineasland again," she said while blushing.

"Huh?"

"Allow me to explain," Susanna said.

"Please do."

"Mom kinda has a tendency to slip into a trance whenever she's around you."

"That's okay. I've gone to Izzyland a few times myself." He then realized something. "Wait...did you call Isabella what I think you did?"

"Shoot. I said that out loud, didn't I?" Susanna facepalmed.

"He would have found out anyway," Isabella commented.

"Found out what?" Baljeet asked.

"Guys," Isabella announced, "when I took Susanna inside, she told me something. And now...I think it's time you learned who her mother is." She placed her hand over Cupidtron's scanner.

Cupidtron beeped. The description accompanying Phineas and Isabella's profile pictures disappeared, as did the line separating them. The pictures began flashing, while a line grew between them and connected them. From the center of this line, a second line moved downwards until it stopped, and a third picture formed under it. When it was all done, Phineas' and Isabella's profile pictures had changed - the pictures now showed them as middle-aged adults. The third picture finally finished loading - a picture of Susanna herself.

"I am," Isabella said.

"Whoa..." Phineas said. He had no idea his suspicion was true.

"No wonder Susanna and Isabella look so much alike!" Baljeet exclaimed.

That was true. Susanna had her mother's head shape (albeit a bit more angular), a normal-sized version of Phineas' nose, and rather than black or bright red-orange hair, hers was a shade of red that was slightly maroon in tint; hair that was as long as her mother's, but a jagged cut at the base reminiscent of her father's.

"The woman in the picture is an older Isabella!" Buford added.

"And when Susanna said Isabella's catchphrase ran in the family, she was serious, and then tried to cover her tracks," Ferb said.

"I had to," Susanna explained. "It would have messed up the plan had everyone besides Mom also known she was my mom."

"What do you mean?" Buford asked.

"Well, if I hadn't come here and gotten Mom and Dad to fess up to liking each other, they would never date, so they wouldn't marry, so I wouldn't exist, so I wouldn't be able to come here. It's a vicious cycle."

"I might have told Isabella someday," Phineas commented.

"Yeah, when you're eighteen. And that's more the reason I came here to this timeframe: an opportunity to make you happy earlier than 2018."

"Susanna, before you came, we were doing all sorts of stuff. Four summer vacations worth, I may add."

"Well, there are only seventy-five days during this break...it's not like there's one hundred and four days."

"None of them came close to this, though. You are the best daughter a guy could ask for. Thank you for what you've done." Phineas hugged her.

"DAAAAD! You're embarrassing me!" Susanna yelled, pushing herself away from Phineas, very red-faced.

"It's what fathers do," Phineas said calmly. "You don't need to overreact."

"We're about the same age right now! That fact adds a whole new layer of awkward!"

"Oh, right..."

"Save the mush for your girlfriend, Dinner Bell," Buford teased.

Phineas gave him a look. Susanna, having calmed down now, said, "Well, I better be going. If I stay, history will be really messed up. And I'm taking Cupidtron with me."

She placed her packet of infinite space on the ground in front of the machine. Pushing with all her might, she slowly inched it over. After struggling to move it, she managed to get part of the rim into the POIS, which pretty much spaghettified (without damaging it at all) the large machine. Once Cupidtron was completely inside it, Susanna picked up the little packet (which only weighed a few ounces) and stuffed it back into the back pocket of her pants.

"But why do you have to take it?" Phineas asked.

"It practically belongs in the future considering what I did to enhance it. On that subject, there are all sorts of things in 2041 I can use to upgrade the machine. Also, I can help more people find their true loves. I happen to know Buford's daughter has the hots for one of Candace's sons."

"Tell her I said she's got good taste," Buford said.

"I will."

Susanna pressed some buttons on and tapped the screen of her wrist-time machine. Her body floated into the air as a blue glow was emitted from the device. The light formed itself back into the blue sphere from that morning, and she took off, the blue flash spiraling upwards, now with a tail. The flash shot off into the west, following the setting sun, before making a booming noise like thunder and vanishing.

"When Mom sees this, they'll be sooooooooo busted!" Candace said, laughing her trademark evil laugh. Then: "Aw, man! It's gone again! Stupid mysterious force," the sixteen-year-old groaned when she saw that Cupidtron was gone.

But then she noticed something else.

"I love you," Phineas said, gazing into Isabella's eyes.

"I love you too," Isabella replied, gazing into his. They hugged.

"Looks like my dating advice paid off," Candace said, not knowing what really happened.

"Are you going to bust them?" Ferb asked his stepsister.

"Nah, too cute."