Poseidon hates being called father, it makes him feel old, which results in percy visiting Mount Olympus a lot just to say I am here to visit Pseodon, father of the fishies.
10 months ago at the celebration of the gods winning the giant war
Percy was talking to Annabeth and Calypso, when Poseidon came over, all bowed to him say "Lord Poseidon" or in Percy's case "Father".
"I would start by saying, Percy, do not call me father it makes me feel old." Poseidon said, "I would also like to congatulate all of you, you too Calypso, because honestly you are what kept Leo alive, and with out him, we may not have been here today, but enough with the sad stuff, lets go celebrate!" Poseidon said. Little did he know what his son, Perseus "Percy" Jackson was planning.
Present day
Percy was getting ready for his visit to Mount Olympus. He sparaticly visits, now that he is a god. He was worried about if wearing shorts was exceptable, but then he thought sonce when do I care what I wear, and threw on the closest clothes to him and ran out of his apartment, to vist Mount Olympus.
He got to the desk man and said, "Can I get to the 600th floor please, I am here to visit Poseidon father of the fishies." He knew, that being a god, he could flash there, but he always did this because it became tradition, and was it was fun to annoy his father this way.
I know it is short but, they will get longer, I hope. ;)