Wolves have a lot of casual sex amongst themselves; the girl wolves can't get pregnant, and with pack telepathy it would be pretty hard to hide a secret crush. Everyone avoids getting serious - well, the lesbians don't, but any couple involving a male wolf has to avoid deep emotional entanglements that would shatter if he imprinted; the Imperial Seer helps, but she is not perfect and they will live for long enough that even a slim chance adds up. But casual sex absolutely happens. Zeus has a friend with benefits by the time he's fifteen (her name is Kitty, but she thinks this is ridiculous, and prefers "Xanthe" after her yellow fur).
He helpfully passes on to the pack that Harley thinks they are all hot; several people take advantage of this information, and Harley has more than one friend with benefits at the age of fifteen.
(Meanwhile, the masquerade is in tatters; wolves are just more convenient than looking for human partners, at least until Zeus decides he's interested in the Seer finding him a suitable imprint.)
This newfound interest does not mean Zeus and Harley don't hang out, even now that they're both sixteen. Presently, Harley is getting his ass handed to him by his wolf-reflexed sparring partner at a mo-cap fighting video game entitled Bloodsport V.
"I don't know if that can even happen," he says, "and I don't think you'd want her to, so - no? Unless you do want her to. Or unless we were going to turn into some kind of... big, huge, horrible disaster, like - oh shit." He blinks up at Zeus, realization dawning. "Oh, shit, I can't break my arm again or anything, can I, you'd explode."
[It... has not been tried,] says Elspeth. [Imprinting isn't like vampire mating in that way. I'll speak to Mama and Jake about a wish design. We'll see what we can do. Is Zeus on board with the change?]
[Yes, I suppose I should've expected that,] sighs Elspeth. [We'll have something to try soon. Do you or Zeus need anything else?]
[Okay. If you have questions about how imprinting works that you didn't ask before, you can of course ask me.]