Климентий, I had been you. This sentence is not passive. It is the past perfect active of the verb "to be". If I had been you = Если бы я был Вами. I am you. Я явлаюсь вами. I was you. I have been you. I had been you. I had you. У меня был ты. --или-- Я имел тебя. I had had you. К тому времени я уже имел тебя. Речь идёт о половых связях