You can see my inspiration for Halys on my blog. I'm sure you can see why Apollo is enamored of him.
From A Tested Love:
“Behave,” Apollo tried to sound strict, apparently to no avail.
“You wouldn’t like me if I behaved.”
Apollo laughed, unable to prevent himself. “Fine, you rascal! Behave until I have you in my bed, then you may do as you please.”Halys’ grin bode well for the rest of the evening.