Looks like Tony's got himself a girlfriend already. Sandy shouldn't have been flirting with him in the first place.
Not all characters get backstories.
Under the heading of "jokes that will never make it into TWB", just after AJ showed up, a couple of readers suggested he might make a good companion to Miki, from the coffee shop.
As I understand it, this sort of thing is called "shipping".
Anyway, I have no plans to do such a thing, but thinking about it I came up with a gag that is unlikely to ever appear in TWB. Assuming Miki at some point propositions Anthony, and he tries to politely let her down:
"I'm sorry, I'm saving myself for marriage."
"You're a virgin?!?"
"I used to be. That's why I'm saving the rest for marriage."