Jack sighed. Right. Of course this wasn't going to be that easy to explain.

"Sebastien was my guardian from the time I was seven or so," he said, more carefully. "I loved him very much. When I got older, the way I loved him changed. But he was hesitant, to let me fully into his court."

He realized that might be oblique. "To bite me. The vampire/courtesan relationship is very ... intimate. Anyhow, I spent a year trying to argue him into it and getting nowhere. Then Irina seduced me, then Sebastien finally gave in."

Happy ending, right?

"Not much like Kate at all, really."