WWW- A former business manager for Marlon Brando is claiming that the late screen legend sexually harassed her and that he had a “disturbing” attraction to underage girls.

We told you exclusively on Monday that the rotund recluse had deeded a Polynesian island sanctuary to his pal, child- molestation defendant Michael Jackson. Now, Jo An Corrales alleges that the “Godfather” star had a closet full of his own young skeletons.

Brando fired Corrales as co-executor of his will 12 days before he died at 80 last July. Monday, she filed a $5 million wrongful-termination suit in L.A. Superior Court against his estate.

Despite being her friend for 40 years, the portly performer would expose his genitals to her and insist that she watch porn movies with him, Corrales claims in her court papers. She also contends he would introduce her to business associates as having “the biggest t–s you have ever seen” and “the perfect mouth for oral sex.” Then he’d call her in the middle of the night to say, “Jo An, I am holding a big one for you,” she claims in court papers.

What’s more, Brando “derived pleasure from sharing his stories of sexual exploitation – including his sexual escapades with minors,” alleges Corrales, adding that he “vividly described” sex acts with his mistress and revealed the “terrible fixation” he had on his mistress’ younger sister and his attraction to “a minor child.”

Corrales, who is represented by attorneys Peter J. Linden and Joel Pipes, has also charged that movie producer Mike Medavoy and the other trustees of Brando’s estate are selling the actor’s idyllic 2,500-acre atoll Tetiaroa for the price of a New York loft. Medavoy and the other trustees have recommended that Brando’s heirs accept a proposal from developer Richard Bailey to pay $2 million to build a luxury eco-resort there, she claims.

But Corrales charges that Brando turned down a previous offer from Bailey of $5 million. She and other estate creditors charge that the trustees have failed to aggressively market both the island and Brando’s Beverly Hills home, which next-door neighbor Jack Nicholson is due to buy, reportedly for $5 million.

Brando’s not around to defend himself against the sex charges. As for possible real-estate sins, Brando lawyer David Seeley argues in court papers that the trustees have done due diligence on the house’s value – and that no other developers have made firm offers for the island.