One thing that sets Icarus apart from other humans Apollo has known, is his utter refusal to be impressed by the gods. There is no falling to his knees with this one; no awed, worshipful gazes. He wields sarcasm well and uses it frequently.
He does not fall for their charms – or at least, Apollo has never seen any effect on him. Never. Apollo is able to make knees buckle with just one well-crafted look. He’s able to make men and women alike swoon with a single phrase. Icarus only rolls his eyes and threatens to spray the god with cold water.
It’s the same with Helios. Certainly, for all he mocks his partner/rival, Apollo can privately agree that Helios can turn on the charm when he tries. He can take all his obnoxious arrogance and turn it into a cocky, flirtatious kind of appeal, when he tries. And he is definitely trying. Trying to impress the boy with tricks, with snark and jokes and his rebellious persona, and his wild motorcycle. Icarus wavers between being politely amused and deeply annoyed.