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ORLANDO -- This was the wake Carrie Fisher would have Room Salon College Girls [Uncut]loved to attend.

Speaking off the cuff for an hour on stage at Star Wars Celebration, Luke Skywalker actor Mark Hamill shared hilarious and not-at-all-sanitized stories about the late princess — such as the time they made out on a couch during their time filming Star Wars in 1976.

That's right — even as Fisher was beginning an affair with Harrison Ford, which she discussed in her final book The Princess Diarist, Luke and Leia were getting hot and heavy as well. This was ostensibly to settle the question of which of them had the better kissing technique, as actors.

"We were like a couple of horny teenagers," said Hamill, revealing that he had been captivated the instant he met the sparkling, intelligent, hilarious 19-year old Fisher, 5 years his junior.

"I wanted her to myself, I didn't want to share her with Harrison," the actor added. But he also knew "I couldn't handle her as a girlfriend."

The makeout session ended permanently when Fisher started laughing uncontrollably. Quintessential Carrie, in other words.

When Lucas revealed to the pair that their characters were twins, during the filming of Return of the Jedi, Hamill says he realized they'd been acting like siblings for years at that point -- because they made each other laugh and get furious in equal measure.

That familial relationship continued throughout the decades. Hamill said Fisher "liked to dress me up" and related one time during a Star Wars shoot that "she made me squeeze into her space tunic" and paraded him around the set.

"I wouldn't have done that for anyone else," Hamill said. "She just liked to dress me up."

For all that affection, she could sometimes make him mad in later years. For example, Hamill told a story of the time they were in competition to see who could get to a million Twitter followers first. He emailed to suggest they both go and pose with their wax figures at Madame Tussauds and take pictures that would "break the internet."

He didn't hear back -- but the next thing he knew, Fisher was posting pictures of herself next to their wax figures at Tussauds, alone. She claimed she didn't recognize his email address.

Hamill choked up reading an annotated version of his powerful statement on Fisher's passing from December, and revealed that he was still going through the stages of grief.

But telling stories in front of a crowd was his form of therapy, he added. Especially in front of the Celebration crowd that Fisher loved to be with when she was alive.

And he knew that wherever she is, she was looking down and smiling -- "and giving me the middle finger."