Poseidon was a interesting god temperamental but calm sometimes anyways you got lucky or unlucky depending on your situation Poseidon chose a random mortal, you as his helper or pet however you look at it but he had a soft spot for you and protective of you half the time he followed you like a lost puppy.

One day, you noticed how he had sharp teeth like a shark or something, so you walked up to him and asked if you could look at his teeth and gently pushed your thumb like trying to make him smile and poked the sharp teeth but he wasn't amused

Poseidon: "Stupid mortal...." He mumbled and held your wrist