That $600 million discrimination lawsuit brought by four ex-employees of Hawaiian Tropic Zone is heating up: the plaintiff accusing one of the managers of raping her in the back of a cab says HT Zone's top brass bribed her with hush money, which is why she didn't go to the cops until some seven months after the incident. We've known for some time that general manager Anthony Rakis allegedly drugged former manager Giulietta Consalvo, then threw money at the cab driver during the assault, saying "Keep driving, buddy." Now court documents obtained by the Daily News reveal that Consalvo was given a $5,000 bonus and a $10,000 raise after the alleged rape, which she accepted in exchange for silence. Owners of the midtown restaurant, whose bikini-clad waitresses make Hooters look like Chuck E. Cheese, are accused of turning a blind eye as Rakis ran wild, demanding oral sex from employees and punishing those who "refused to submit."