The Thousandth Man, by
athousandwinds.
PG. Implied Ten/Jack and Doctor/Rose/Jack.
Jack's a people person, but he's always ended up alone.
Spoilers: Parting of the Ways.
Halfway round the universe with only a backpack for company made anyone a loner. Making connections just wasn't worth it when you were only going to spend the day. There wasn't time.
"There's always time!" a man whom Jack met once insisted. "I mean, look how fast we became friends!"
"Sure," Jack said, amused. He kissed the guy's shoulder (he was way too skinny and had the chirpy, curious look of a clumsy baby bird) and added, "Why did you hug me?"
"No reason." The sharp face took on a guilty cast. "I like hugging people. Is it illegal here?"
"It's Victorian England."
"Oh." The man considered this. "Nah, it's fine. I'll just tell 'em I'm French."