Author's note: I do not own Fullmetal Alchemist or its characters. This is for the 30 Kisses challenge using list epsilon. Theme 4: Quid Pro Quo (One Thing for Another).

Equivalent Exchange

It started on a very bad day. Riza had been having the day from hell, and Mustang had temped fate. He'd had something with chocolate in it for lunch. She had seen the stray bit of chocolate on just at the corner of his lips. The door was shut behind her, and Riza followed her impulses for once. She kissed the corner of his mouth, her tongue flickering out to taste the traces of chocolate on his skin. Riza pulled away to find Roy staring at her with dark eyes. Riza just smiled and walked out of the room, leaving the files on his desk.

That had started it. Over the rest of the course of the day, Riza found herself looking for opportunities to ambush the man. She managed to kiss him twice more before he turned the tables on her. They had been heading back from a meeting and discussing their next plan of action. Mustang had waved her into his office then backed her against the door and kissed her nearly senseless. That was when thing got serious.

There was a contest going on, and they were the only ones who knew it. She had the advantage for the most part. Things had started two-one in her favor, and Riza kept her lead for the most par. They found ways to work kisses in between almost any activity when they were alone. They tried to be sneaking about it, but that didn't always work. It became almost common place. Her lips just brushing his cheek before she flitted off back to her own desk. Mustang pressing a kiss to her knuckles as he took files from her hands. She dropping kiss on the top of his head when she proofread papers over his shoulder. Riza knew that they were taking a risk by doing this in the office, but neither one of them was about to back down. It had almost gotten to the point where they were even with a kiss for a kiss score wise.

It lasted a week. Riza knew things were getting dangerous and had warned Roy that whoever had a higher score would win. Of course, she didn't mention what the prize was. It had been a neck at neck until the last few hours. She had leaned over his desk, setting down a stack of papers, and he couldn't help himself. The next thing she knew she had been pulled into his lap. His arms slipped around her waist, holding her in place while he kissed her. Then barely ten minutes later, Roy sealed the deal.

With her arms full of paperwork, it was an easy victory. Roy backed her into a wall and kissed her until he heard footsteps in the hall. When he pulled away his eyes were dark, and his lips were warm beside her ear. "I win."

She nodded breathless and made her escape. She had some plans she needed to make. She really wasn't too upset about losing, but she had a feeling that Mustang was going to be pretty pleased with his spoils.

Roy came home to find Riza curled up in his bed. She smiled up at him. "Don't you want your prize?"