Jon Cryer, the John Hughes sweetheart turned nebbish primetime star, was always going to be the legacy of CBS’s sitcom “Two and a Half Men.” And Cryer’s legacy was always going to be a biography about his wild co-star, Charlie Sheen.

Cryer said that Charlie recommended prostitute services, made jokes about his run-ins with the law and ex-wives, and became ‘madder and madder’ during his drug-induced meltdown during the show’s last season.

Cryer seldom spoke in public, with the exception of a few interviews and a late-night TV sketch ridiculing Sheen. Cryer benefited from it, as he silently went along and collected his millions, appearing in four more seasons with replacement Ashton Kutcher after Sheen’s breakdown.

While Cryer’s autobiography, “So That Happened,” doesn’t officially come out until April 7, excerpts are already available, and The Hollywood Reporter has previewed some of the most compelling passages, which detail Sheen’s drug use, advice to Cryer on soliciting prostitutes, intense salary negotiations, and more.

Sheen once knocked on Cryer’s dressing room door  in a panic because his then-wife Denise Richards had unexpectedly dropped by for a visit. Sheen asked Cryer to hide a suitcase full of pornography, so Cryer naturally looked into what type he was into.

Charlie said,”One day during the first season of Two and a Half Men, I got a knock on my trailer door. It was Charlie — my trailer was next to his — and he seemed panicked.

“Dude! Dude! I need your help.” “Sure thing,” I said and ended the cellphone call I was on. “What’s going on?”

“He handed me a heavy shopping bag. “Denise is coming over,” he said, “and I need you to hide something for me.” Oh, boy, I thought. If this is drug paraphernalia …

“Is it legal?” I asked. “What? Yeah, oh, yeah. It’s legal. Hey, thanks.” He left, and I had to look.

“I was prepared for the weirdest, but it really was all pretty tame, some of it just topless mags,” said Cryer. “Really, if this was the worst I’d have to deal with regarding Charlie’s vices, bring on the bags of porn for me to hide.”

The New York-born actor claimed Sheen was a “pretty grounded, sober married guy” when the show premiered in 2003, but by the second season, both were single as Sheen’s marriage to Richards fell apart and Cryer divorced his British wife Sarah Trigger, with whom he had a kid.

‘We talked about prostitutes,’ Cryer recalled.

‘I was in a bad state right after my divorce, and I certainly didn’t feel dateable,’ he said. ‘Charlie suggested a few online purveyors he used, as this was when prostitution was gaining a foothold on the Internet.’

Chuck Lorre previously exacted his vengeance on Sheen by writing a series finale last month that almost entirely mocked Sheen (who verbally abused Lorre during his breakdown) and finished with a piano falling on a Sheen impersonator. Now it’s Cryer’s turn.

Cryer noted that when he and his co-star went to Las Vegas to meet with a group of CBS affiliates, he was “ready to get the Sin City tour from my co-star.” “Instead, he went to his room and took a nap. We showed up at the party for the syndicated stations, and then Charlie went back to his room to sleep. I watched our director, Jim Burrows, play blackjack. What happened in Vegas didn’t have to stay in Vegas because it was boring as shit.”

Cryer, who turns 50 next month, received his big break in the film Pretty in Pink alongside Molly Ringwald and Andrew McCarthy, but he achieved permanent stardom after being hired as Sheen’s brother in the Chuck Lorre-created comedy.