He hadn't meant to sleep with her.
And that sounded like a lie, because he was Jack Harkness, immortal alien who shagged anything if it was gorgeous enough — and she was. But he did have some respect for relationships — even if it was Rhys Williams. Gwen needed a normal life outside of Torchwood. She needed to maintain the human perspective.
But she'd walked right into the Hub, smelling of cigarette smoke and clearly drunk. She'd collapsed on him crying about how everything in her life was changing and how she'd seen horrible things, but she'd never thought humans could be so awful.
"You're safe now," He'd told her. He'd walked her upstairs, her stumbling the whole time, and tucked her into the spare bed upstairs.
But as soon as she pulled him down with her, as soon as their lips touched, it became evident that going to bed wasn't going to happen.
She'd had a condom in her purse, and somewhere, he'd wondered if it was planned, if that had been exactly what she'd wanted when she came to the Hub — but he dismissed the thought. Right now, she was safe, he hadn't lost everyone, she was with him and that was all that mattered.