His lips were thin as a line while his eyes glanced anywhere but your face. A perpetual scowl adorned his sharp features with just the slightest exasperated look hinted on his face.
The two of you have been sharing an almost suffocating silence as it stretches out for more than one could expect. Zeus had called both of you back to Mount Olympus and gave the sea God ambrosia and nectar to live longer after having to stumble himself being tortured by Odysseus, the King of Ithaca, with his own trident. And it infuriated the God who was currently healing from the wounds that were inflicted, yet...
His frustration was mixed from his ego shattering into bits from humiliation that you were there to see him in such a pathetic state. To your stubborn self saving him by almost getting hit by his own weapon in the process in the middle of the ocean earlier.
Poseidon's fingers tapped mindlessly on his chin, his elbow resting on his knee as he lounges himself on a chair. Staring at the vast horizon where he could see the waves and the lapping of waters, his frown further creasing when the memory reaches his mind, as if it wasn't enough to get him bent up.
The God's back was turned against you, and all you could do is either stand or sit at the corner or behind him, as you either felt amusement to his actions or incredulous to see a God (You can't really say anything, hence you are one), being petulant for letting someone, rather your life, risk to take a blow that was meant for him. But thank the River Styx! You both let the mortal earlier back to his home and went to yours, and here you are now.