At least he’s forthright.

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

“I went into an apartment,” cops say he admitted when busted for taking another sleeping woman’s wallet after making a delivery to her West 42nd Street building in late August.