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The Notorious B.I.G. 's son, CJ Wallace , is firing back at the publicist who sued him earlier this summer ... filing his own defamation lawsuit against this publicist for claiming CJ helped lure him to a place where Diddy sexually assaulted him.

We broke the story in July ... Diddy and CJ were both sued by an anonymous man who claimed he was lured by CJ, Willie Mack , and several others to be hand-delivered to an awaiting Diddy ... who allegedly attempted to force oral sex on him. Gallery Launch Gallery Getty

According to the new legal docs, filed this week in Florida, CJ is now suing Jonathan Hay , who has admitted to being the John Doe in the earlier suit.

CJ says the accusations stem from a failed deal for the release of Hay's "Ready to Dance"

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