At least he’s forthright.

A month before confessing to being “horny” in attacking a sleeping Upper West Side woman, so called “Pizza Boy Rapist” Cesar Lucas, 16, had also easily ‘fessed up to an on-the-job burglary.

“I went into an apartment,” cops say he admitted when busted for taking a different sleeping woman’s wallet after making a delivery in her West 42nd St. building in late August. Lucas pleaded not guilty to the burglary; he remains held pending his Oct. 30 arraignment on the rape charges.