Poseidon
The outright chaos of the situation shouldn't have come as any type of surprise to Poseidon. But it wasn't until about a quarter of the way into the trip that the gravity of the situation really struck home.
Maybe it was an innate sense of optimism that blinded him (really the worst trait you can have when you're a god.)
Or it could have been the fact that Hera was coming along, and Poseidon hoped she'd work as a buffer or at the very least form of restraint.
But Poseidon was often disappointed by life,
and this situation proved to be no different.
Within thirty seconds of him putting on his whale sounds CD, Zeus was leaning into the front of the car from where he was sitting in the back with Hera and was unceremoniously flicking off the stereo. Muttering under his breath about how he now understood why Pi didn't 'get any'.
"I really don't understand why you're with him, Hera. The guys a sex Addict. How many people have you impregnated on this trip, Zeus?"
The silence the emanated from the back seat lasted a little longer than anyone was comfortable with, and without turning around, Poseidon knew Hera's expression was murderous.
"Two….Okay, three. Maybe four. But the last one doesn't count seeing as how he was male. I can't impregnate a man...can I?!"
Pi chuckled, and the chuckle grew into a full outfit of laughter upon hearing the choice words coming from Hera in the back seat.
Hades, on the other hand, was seemingly glad to have the attention shifted off of him, as just an hour before Zeus had taken to referring to him as the 'boner lord' which resulted in Hades completely losing his shit and calling Persephone in tears.
The crying got so bad, Pi was forced to stop the car at a gas station and buy him a twinkie, a plan that worked until Zeus made more unsavory comparisons between the twinkie and boner lord.
Poseidon was on the verge of losing his mind. Already. And they were only three hours into what was expected to be a twelve-hour trip.
Gods help him.