Songfic of Mac/Stella/Peyton(sorry :s). Also, the story is a bit AU, Mac and Stella used to be together, but broke up to be with Peyton. So uh, hope you can bear through the Peyton/Mac scenes :\ Also, it's kind of a “not happy” fic thing. Read it and you'll know what I mean.
Also, I wrote the song myself, it''s called Tower of Regret. First song written that I actually was content with.
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“Hey, Mac.” Mac smiled as he saw Dr. Peyton Driscoll at his office. It's been a long, hard day of working on a complicated case involving a very smart murderer. Though Mac's team proved all of New York that they could outsmart any suspect, everyone was exhausted and already headed home. He didn't know who was still at the crime lab.
“Finally got the guy, huh?” Peyton asks, coming in. “Good job, I've heard about everything on the news.” “
Yup,” Mac replied. “The city's relaxed now.” Peyton nodded.
“So,” she started. “Want to celebrate? I can bring you to a nice Italian restaurant near the department.” “Sure,” he replied. “Frustrating case... I guess we need to take a break. Now?”
“Well, it's 11:42pm, so sure.” Mac smiled as he took her hand and headed out of the precinct.

As Mac and Peyton walked hand-in-hand through the crime lab, he caught eyes wit his best friend and ex-lover Stella Bonasera in her office, doing paperwork and staring at the crime lab blankly with her chin resting on her hand. Mac and Stella's eyes met for a few seconds, and then Stella went back to her paperwork. Though it was only a few seconds, Stella's eyes had said everything to Mac. A few weeks ago, Mac had broken up with Stella because he wanted to spend time with “the beautiful medical examiner”.
This made Stella mad, because she had said “it wasn't like him” and he “went with her because she's just beautiful”, but Mac just thought she was jealous. Now, judging by her eyes, Stella said something, something that Mac never noticed. She wasn't jealous, she needed Mac, but yet she was also infuriated at him. Now, Mac wasn't really up for the Italian dinner anymore.

“Peyton?!” Mac exclaimed as he walked in the medical examiner's office the next day. Peyton was flirting with a new ME, and he seemed to like it. Yet they took it far that he leaned in and kissed her- only to be interrupted by Mac.
“Oh, Mac,” Peyton replied. “I just-”
He pulled Peyton to a private area. “I thought we were in this together,” Mac said.
“I forgot to tell you,” Peyton replied nonchalantly. “I'm going to leave for London in a few weeks, so let me have fun, alright?”
Mac stared at her for a while with an “I can't believe you” face. He shook his head and headed out the ME's office.

“Stella, can we talk?” Mac stepped in Stella's office, feeling nervous. Lately, they had both agreed to “stay friends”, though it seems as if they weren't.
“Please Mac,” Stella replied, looking up from her . “If you want to get back with me, I don't know. I know what happened in that ME's office this morning, I was there.”
Mac sighed as he stared at Stella. Her eyes were the same as before, hurt, just hurt.
“I'm sorry, Stella,” Mac mumbled. “It was idiotic of me to make the decision to be with Peyton, only judging by the look. I know how much we need each other, and I want to start over, pretend nothing happened, because I learned my lesson...”
Stella sighed, her eyes looking at her paperwork, then Mac, then her paperwork. She repeated it for a couple of times.
“I don't know,” she then whispered, getting up and leaving her office and leaving Mac alone.
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Don't worry, there's a sequel.
There's an extra verse that I left out because I didn't need it in, but here it is:
You stand in sadness
With a mist in your eye
Leaving your wall tumbling down
Anger in shame
Anger in regret
You will never forget