I don't think Percy is really the type of person to confide in anyone, for any reason. I think when it comes to his real feelings and emotions, he prefers to keep them to himself. I can't think of a conversation when Percy tells anyone what he is feeling, or a conversation when anyone talks about how Percy felt about something. I think he's a very private person, and that he would never confide in someone he hardly knows.
I'm in the middle of a fic where Percy meets someone he inherently trusts. He can objectively state that he has no reason to trust the person, although he has no reason to distrust the person either. Would he go with that feeling and confide in that person, or is he too logical to follow his instincts?