Disclaimer: HAHAHA!! You think I own the ninja turtles. Well I don't. I don't own the Pythagorean Theorem either...some ancient Greek dude does.

SHOUTOUTS: (I love this)

Linchi: Yeah. I have a reason. I felt like it. :) Nah, just kidding, Raph was out because I needed a reason for Mikey to feel guilty.

Saphire-Cat: thinks hmm....how could I do that to Mikey...oh, I know, I'm the author! Being evil to my characters is fun sometimes....thanks for the review!

Sulwen Undomiel: Oh dear! How could I leave you hanging on a cliff like that! tosses rope there ya go...enjoy the next chappie.

Pacphys: Yes, I am good at cliffies, am I not? I am famous for it...anyway, I don't know why Mikey was so tired! It was a good idea at the time...and goodness, your school was even crappier than mine, which is pretty bad! LOL.

Dory's Human Replica: Hmm...yes, where WOULD we be without cliffies? There would be a lotta bored people out there! Now you can know who came into the room...

Donny's Girl: Yup, I love Mikey stories too. Hence, why I'm writing one, lol. Thanks for the review.

A/N: Okay, I have to say all you guys are AWESOME. I have been getting nothing but great reviews! Which I was actually pretty surprised at. I wasn't sure how people would react to Lona. (Not that I'm complaining...) okay, enough rambling. Your story awaits!

Mikey's head shot up and he could do nothing but stare at the door as it opened.

Lona's brown head popped back in. "I forgot," she said almost shyly, "do ya need anything while you're here?"

Mikey shook his head. Lona smiled at him and disappeared once more.

Mikey let out a breath he didn't know he had been holding, and proceeded to continue his hunt for something interesting. He finally decided upon a rather large literature book.

Lona ambled through the hallways, humming softly to herself. She wasn't in any big hurry to get back to math class. She squinted at some random scrawling on the wall that had been done in permanent ink. It read: Ashley & David 4-Ever!!

Lona shook her head. Yeah right. She knew from experience these idiots who spelled out their entire personal lives on school hallways and bathroom stalls never really got what they wanted. She grinned. Maybe it's cause they write every little thing in plain view! Lona scratched her head. She'd never understand other kids her age.

Finally reaching the door to her math class, Lona opened the door to hear her teacher saying,

"-And that finishes up the Pythagorean Theorem." Noticing Lona's presence, he motioned her in. "Ah, Lona, good. You missed our discussion on the Pythagorean Theorem, but you can do the work in pages 175 to 180. It's pretty well described there."

Lona sank into her seat and pulled out her math book, hoping she could at least get an idea of what she was supposed to do before the bell rang. She opened to the designated page, and stared at all the confusing diagrams of triangles with letters and numbers all over the place. Crap.

Mikey glanced up as he heard yet another bell ring. He glanced at the clock. Two-thirty. Lona had said that's when her school got out, so Mikey assumed the last bell he had heard marked the end of the day. He gently closed the literature book he had been reading and shoved it back in the box in which he had found it. He shook his head. Time flies when you're reading, I guess. Now he understood why Don and Leo could disappear for hours and hours when they got their hands on a new book that hadn't been damaged in the sewers.

Mikey heard the door open, and peeked out expectantly from the upturned table he had been leaning against.

Lona slipped into the room, shutting the door behind her. Noticing Mikey's green head poke up from behind the table, she smiled.

"Hey Mikey," she said tiredly.

Mike cocked his head at her. "You sound really tired, dudette." He said. Lona laughed. "School does that to ya. Especially this, ugh." Lona pulled a heavy book with a blue cover out of her messenger bag and showed it to him. It said Geometry: Third Edition.

Mikey shrugged. "So?"

Lona opened the book to the designated homework pages, and showed him. "Whoa..." Mikey breathed. "That is seriously hard stuff." Lona nodded.

"Seriously. And I have no idea what's going on!"

Mikey thought for a moment, then grinned at her. "I know the perfect guy who can help ya, Lona. This guy is a total expert at math."

Lona blinked. "Um...okay. But first we need to get out of here without being seen. There's still people in the hallway."

Mikey shook his head. "Nah. That's what being a ninja is for!"

Thirty minutes and two freaked out people later, Mikey and Lona slipped into the sewers via manhole.

"Um...are we going back to your home?" Lona asked nervously. "Because I don't think that blue guy liked me."

"Ehh, that was just Leo." Mikey said. "He's my big brother. Actually they're all my big brothers. I'm the baby. At least, that's what they say. We can't really tell how far apart we are."

Lona took this in, then asked, "By the way, Mikey, just how old are you?"

"Sixteen." He said proudly. "Just turned it in June." He looked warily over at Lona. "How old are you?"

"Sixteen," she giggled, "Same as you."

Mikey laughed. "Cool. I never met a human teenager as cool as you. All the ones I meet are trying to rob Best Buys and Comp USA's and the like."

Lona shook her head. "I can't believe it..." she muttered. Mikey turned to look at her. "What?"

Lona sighed. "Nothing...so what are your brother's names?"

Mikey started to count on his fingers. "Well, there's Leo, he's the blue one who gave you that bit of trouble, and then there's Raph. Uh...I won't go into him at the moment. You'll find out soon enough anyway." He proceeded counting. "And then there's Donnie. He's the one we're going to see about your little math problem, he's a total genius!" Mikey, realizing he only had three fingers, put his hand down. "And then there's me," he added, almost as an afterthought.

Lona put a hand on his arm. "Well, I think I like Michelangelo very much."

Mikey smiled. "Come on," he said, pulling Lona over to a little out of the way alcove where the metal door to his home was hidden. "My brothers are probably going nutso."

He pushed the door open, to be greeted with a very irate Leonardo. "Michelangelo. After what happened to Raph, you can't just leave! I mean, I know Master Splinter said you could go, but he didn't mean for the whole night and half of the next day! You had us worried out of our minds and-"

At this point, Leo had noticed a familiar brown-haired girl trying to hide behind Mikey while he yelled, which was proving difficult, since she was taller than him. "And you brought her here, again?" Leo shook his head. "I can't believe this Mikey..." Leo made a noise of frustration, and stomped off somewhere.

Mikey turned to Lona. "Don't worry about him, he'll get over it. But...I need to go talk to my dad. See that sub car over there?" He pointed to a broken down subway car that looked like it had been hit by a- well, by a train.

"Yeah?" Lona said cautiously.

"That's where Donnie is. At least, he'd better be. I'll be there as soon as I can, okay?"

Lona gulped. "You mean you're not coming with me?" After that incident with Leo, she didn't want to meet another one alone. Sensing this, Mike smiled reassuringly at her. "Don't worry, Donnie's not like Leo. You'll like him, I promise. Now I really have to talk to sensei."

Mikey turned and disappeared into another tunnel. Lona blinked. I thought he had to talk to his dad? And what in the world is a sensei? Lona shrugged, deciding she would figure it out later. She decided to go see this Donnie.

Lona cautiously approached the broken down subway car and rapped on the metal door. "Not now, Mikey, I'm busy!" Came a voice from the other side. Lona bit her lip and slid the door open. Another turtle who looked exactly like Leo and Mikey -except for the fact he wore a purple bandanna and had a different skin color- sat with his back to her, messing with some kind of computer program.

"Um...excuse me?" She said timidly.

The purple clad turtle whipped around and was at her throat within seconds wielding some kind of stick thing. "Who are you and how did you find us?" He growled.

Lona squeezed her eyes shut and brought her hands to her face. "Please don't hurt me, Mr. Turtle, it's just, Mikey told me to come in here, and-"

At Mikey's name, the new turtle slipped his stick back into his belt. Now instead of an angry expression, he wore a puzzled one. "You know Mikey?" He asked, "How come he isn't here?" He peered around Lona, as if expecting to see his younger brother standing behind her.

"He...he said he had to go talk to your father." Lona said. The turtle fixed her with the same curious stare.

"What's your name?" he inquired.

"Lona." She said, her brown eyes huge.

The turtle visibly relaxed, and held out his hand. "I'm Donatello." He said. "Mikey spoke about you. Now I know who are; sorry about the weapon, you just have to be careful, you know?"

Lona nodded. In fact, she didn't know, but she didn't want to make Donatello angry again.

Donatello cocked his head at her. "So...is there a particular reason why you're in my room?"

Lona looked around for Mikey before answering. Disappointed in seeing no trace of orange, she said, "Well, Donatello, was it?"

"Most people call me Don," Donnie said.

Lona nodded. "Well, Don, I had this problem with math, and Mikey said you could maybe help me?"

Don stared at her. "That depends. What kind of math are we talking?"

Lona held up her heavy math book. "Pythagorean Theorum?" she said.

Don nodded. "Yeah, I can help you with that, look, it's easy..."

Lona took a seat on his bed while he pulled up his desk chair and started to explain the mysteries of triangles.

Meanwhile, Michelangelo knocked softly on Splinter's door and stepped back. There was some shuffling, and then the door opened to reveal Splinter's hairy face. "Ah, Michelangelo. You are back. Good, Leonardo was beginning to get worried."

After he got over the initial shock that Master Splinter wasn't making him do flips for getting back late, Mikey shook his head. "I'm sorry I'm late, sensei, I-"

Splinter put a clawed hand up to stop him. "Do not worry about it, Michelangelo. Everyone needs to get away once in a while."

"Yeah, but-"

"Do not question me, Michelangelo. Why don't you bring this new girlfriend of yours to meet me in here."

Mikey bowed, blushing slightly when he realized Splinter had called Lona his girlfriend, and went to get her from Don's room.

How'd he know she was here? Mikey wondered, as he made his way from Splinter's room to Don's. Mikey shrugged. Splinter seemed to know everything, and he wasn't going to question it.

Mike came to Don's subway car and pushed the slightly open door all the way open.

Lona was sitting cross-legged on Don's bed, and Don was sitting next to her in her desk chair. Both were bent over the math book, and Lona held a calculator.

"Now you find the square root...and you're done." Don said, as Lona showed him the answer on the calculator.

Lona stared at her notebook as if it had suddenly grown teeth. "I...can't believe I understand this..." she said, "I could never understand it before."

Don shrugged and took his calculator back. "It seems to me that you could have understood it all the time, but you had already decided you couldn't."

"Hate to break up this party, Don," Mikey interrupted, "But would you mind if I stole Lona back?"

Don absently shook his head, already back on the computer.

"Hey Mikey," Lona greeted him, as she rose from the bed and slipped her notebook into her bag. "What'd your dad say?"

Mikey grinned. "He said he wants to meet you."

Lona looked up. "Really? What's he like?"

Mikey thought for a minute. "He's kinda...kinda like Leo, except more intense." Seeing Lona's worried look, he laughed. "He's nice, don't worry." He led Lona outside into the main living area, so she could drop her messenger bag on the couch before she went into Splinter's room.

In front of Splinter's door, Mikey knocked softly once again, and the door opened a bit more quickly than usual. Splinter stood in the doorframe. "Michelangelo," he said, "Did you retrieve your friend- ah, I see her." He said, catching sight of Lona once again trying to hide behind Mikey.

"Come, my child," he said, motioning Lona inside. Chuckling at Lona's reluctance, he said, "Do not worry. I do not bite." Lona glanced at Mikey and disappeared into Splinter's room.
"Michelangelo," Splinter said, "Raphael woke up a half hour ago. He is still in the sickroom. Perhaps you would like to go see him?"

Getting the hint, Mikey bowed. "Yes, sensei." He waited until Splinter shut the door behind him, then retreated off to the sickroom.

"Hey Raph, how ya doin'?" Mikey inquired, upon entering the makeshift hospital.

"Just fine, Mikey," Raph said, "I really shouldn't be layin' useless around here, but Donnie said I hafta."

Mikey cocked his head. "Hey Raph?"

"What?"

"Was there poison on that dart?"

Raph laughed. "Yeah right."

Mikey was confused. "But...then why were you unconscious?"

Raph frowned. "Bastard put heck of a tranquilizer in there."

Mikey nodded. He understood now. "Can I get ya anything?" he asked.

"Yeah, how 'bout some food." Raph demanded.

"Comin' right up!" Mikey said, leaving and coming back with four slices of microwaved pizza.

Staring at the food, Raph said, "Jeez Mike, I'm hungry, but four pieces?"

"Two for you, two for me." Came the answer.

"Figures," Raph muttered, digging into his own slice.

"Hey, ya mind if I put on the TV?" Mikey asked. Last time Mikey got hurt, he had gone out of his mind without a television, so Don and Leo had installed one in the sickroom.

Raph shook his head. "Nah, I don't mind, as long as I pick what we watch."

Mikey grinned. "Fair enough. What channel?"

"Three," Raph said, "Local news"

Mikey twisted the knob of the ancient TV to three, punched the TV a few times for better reception, and sat back to watch the news.

Inside Splinter's room, Lona watched nervously as the giant rat made himself comfortable on a red cushion. He motioned for her to do the same. Choosing a green cushion, she dragged it in front of the rat and sat down.

Splinter watched her for a few moments before beginning. "Might I inquire about your name?" he asked.

"Lona." She said.

"Ahh, Lona. A beautiful name. I am Splinter. You may hear my sons call me sensei. It is a Japanese word, it means 'teacher.'"

Lona nodded. Well, that explains that. "Excuse me, sir, but-"

"You may call me Splinter or sensei if you wish as well, Lona."

"Oh, well, Splinter, I don't mean to sound rude, but I was expecting another giant turtle."

Splinter smiled. "Yes, people often make that mistake when they meet my sons," he said, making Lona wonder just how many people in New York knew about them. Splinter then went on to tell her their origin story.

"Wow," She said, when he had finished. "That's amazing. I used to pretend stuff like that happened, but I never thought...wow."

Splinter nodded. "Lona," he said, "You must never tell anyone about us. It would be very dangerous, for obvious reasons. Do you understand?"

Lona nodded. "Yes, sir, I mean, Splinter, I mean, sensei."

Splinter smiled. "Go on now, go 'hang out' as you say, with Michelangelo. I am sure you will meet the rest of his brothers in good time." And with that, he dismissed her.

Coming out of Splinter's room, Lona couldn't see Mikey in the main living area. Slowly turning in a small circle, she heard the noise of a TV coming from one of the subway cars. She followed it until she found the source, and slid the door open.

Mikey was sitting on a chair, watching the television. "Looks like crime has gone down, Raph," he said.

Lona turned. Mikey was talking to another turtle with a red bandanna who was lying in some kind of hospital bed. And he didn't look very happy about it.

Lona's eyes widened as the red banded turtle noticed her standing in the doorway. "Hey, who's that?" He asked Mikey, in a thick Lower East Side accent.

Mikey turned, spotted Lona, and grinned. He got up, and dragged Lona over to Raph. "Lona, this is my other brother, Raphael."

"Nice ta meet ya," Raph said roughly, then went back to the TV, totally ignoring both of them.

"Don't be offended," Mikey told Lona. "He does that all the time. Especially when I beat him up."

At this, Raph scoffed. "Yeah, sure, Mikey. You beat me up."

Mikey grinned even wider. "Well, I could," he said. "I'll hold out my fist, and you run into it."

Lona burst out laughing at Mikey's comment. "That...that is so funny," she gasped.

Mikey beamed. "See Raph, people think I'm funny."

"She'll get over it." Came the reply.

"-Firemen from all over the city are reporting-" Lona suddenly turned her attention to the television.

"-to the giant blaze. It was suspected arson, though the motive remains unclear-"

Lona gasped as they showed a picture of a large apartment building being consumed by flames. "That's my building!" she cried. She ran out of the room, Mikey following. He out a hand on her shoulder. "Lona, wait, fires are really dangerous, and-"

Lona looked up at him, tears running down her face. "I have to make sure my uncle is okay." And with that, she ran out of the lair.

Mikey picked up Lona's discarded messenger bag and immediately followed after her.

A/N: Whew, long chapter this time. Good for me! I picked the Pythagorean Theorum because that's the only math I understand. And I know Don's weapon is called a bo staff, but Lona doesn't. R&R.