You really have been rping a long time. I think I started in 2004, if I remember right.
Bastet and I have been talking about Sarah jane investigating the Easter Eggs from Blink and meeting Sally Sparrow that way. Luke is very welcome to come along.
I bet Jack is very curious about Luke as well. He'll give Luke a tour through Torchwood any time. ;-)
Maybe when Torchwood has a problem, possibly with the alien substance that infects people Jack could contact Sarah Jane & Luke to get help. He knows about Mr. Smith now, who might be able to figure out what the substance is. ;-)
And the doctor surely will come by sooner or later and meet Luke. He surely will be delighted to meet a human that might actually understand what he's talking about. *g*