Trust and confidence may in fact exist though the parties occupy no technical relations to each other.1 One partner may, in fact, repose actual trust and confidence in the other.2 Between persons in such relations, and in transactions advantageous to the person occupying the dominant situation, undue influence will be presumed to exist.3 If A had in fact become dependent upon B for advice and counsel, a transaction by which A leased oil lands to B, and B reassigned a part thereof to A for a very high price, will be set aside.4 If the transaction is shown to be a fair one, it is not essential to its validity that the grantor or promisor should have taken independent advice before entering upon the transaction.5