My first fanfic, so constructive criticism is welcome. But please try and be nice. It was originally going to be reasonably short, but I couldn't stop writing. It's in chapters, but I'll need to be told how well it works. R&R please.

Disclaimer: I don't own any of it. Everything belongs to that lovely man, Russell T Davies.

It had been a mistake. A stupid, drunken mistake. A one-time-only deal. He had to keep telling himself that. He wasn't sure if he quite believed it but that's why he had to try and convince himself. But as he watched her walk across to her desk, sit down and begin typing furiously, a biro clamped between her lips, he knew it wasn't true.

The night had started innocently enough. The team had had a tough day, involving a trek through Cardiff's sewers in search of an injured Weevil. As soon as the clock back at the Hub hit 5 o'clock, Jack announced that enough was enough, they'd been hard at work since 4:30 am, and that they were going for drinks.

"First round's on me," he said, picking up his coat. No one was about to argue with that so ten minutes later, they set out for a bar in the city centre, one of their favourite haunts.

Jack and Ianto were getting the seventh round in and Tosh had gone outside for some air, when Gwen's mobile beeped. She glanced at the display and sighed. Then she flipped open her phone and tried to show some enthusiasm.

"Hi Rhys!" she trilled in a voice laden with false cheeriness. "No, no, I don't know when I'll be home…sorry sweetheart…I got a call off an old friend from uni whose in town for a couple of nights, so I met up with her for a catch-up…her name?...It's, erm, Jodie. Have I never mentioned Jodie? I'm sure I have…anyway, she's coming back with the drinks so I'd better go…talk to you later…yes, I love you too…bye now!"

Owen looked at her sceptically. "You're too good at that. It's not a healthy relationship if you find it so easy to lie to him."

Gwen's face flushed. "I don't think you're in any position to judge other people's relationships, Mr Can't-Stay-With-One-Girl-For-Two-Consecutive-Nights," she hissed maliciously.

It was like a punch in the stomach, but Owen wouldn't let her know how deeply that comment hurt him. He put on a cocky sneer.

"I pity you Gwen. Alright, so I don't have a great track record as far as commitment goes but at least I'm not throwing my life away, settling down with one person. Especially when that 'one person' is someone I have repeatedly lied to and cheated on, and who I'm only marrying out of a mixture of pity and insecurity. You're as bad as me Gwen. At least I upfront about my inability to commit. You can't even admit what you are."

"And what am I?" Gwen asked in a voice that suggested more confidence then she felt.

"A lying, cheating little slag! Remember Gwen, I know you better than anyone else. You'll never admit it, but I do."

Gwen felt…strange. She should hate Owen for all the things he was saying, but she couldn't. As she looked at the mouth that had seconds before been spitting insults at her, the only thing she wanted to do was kiss those full lips. The angry passion burning in his eyes was exciting and made her want him all the more. She took a deep breath to steady herself and desperately tried to control her lust.

"Well if that's the case, do you know what you are? A self-centred, arrogant, egotistical bastard with an unfeasibly small – "

She was cut off by Jack and Ianto's return. Owen took his pint from Ianto and downed half of it in one go.

"Wow, someone's thirsty," Jack commented as he sat down. Owen drained his glad and stood up.

"I need a piss," he announced coldly and stalked off. Jack turned to Gwen.

"Right, what did you say?"

Gwen looked stunned. "What?"

"We all know Owen. We all know his little mood swings. And we all know that the only people who can ever piss him off that much, are you and Ianto. As Ianto was at the bar with me, it must have been you. What did you say?"

"He started it!" Gwen hadn't realised how childish that would sound until she'd said it. She took a deep breath. "He made a crack about Rhys and the wedding. OK, I might've said some stuff that was uncalled for, but so did he."

Jack sighed wearily.

"Gwen, Owen is always going to wind you up about something. You need to learn to control your quick temper and your sharp tongue. I can't have you at each other's throats 24/7," He laughed sardonically. "God, I sound like an over-worked parent!"

Ianto took his hand under the table and gently stroked the palm with his thumb. This always made Jack feel calmer.