Looks like it wasn't sodomy:
https://www.theguardian.com/australia-news/2019/feb/26/five-times-guilty-how-geo...Pell pulled out his penis and approached the other boy, grabbing his head.
The complainant asked Pell, “Can you let us go? We didn’t do anything.”
“I could see his [the boy’s] head being lowered towards his [Pell’s] genitalia,” the complainant recalled. “Then he sort of started squirming, he was struggling. His head was being controlled and it was down near archbishop Pell’s genitals. I was no more than a couple of metres away.”
This took place for about a minute or two. Pell stopped and turned to the complainant.
“And then he put his penis into my mouth. Archbishop Pell was standing, he was erect, and he pushed it into my mouth. He instructed me to undo my pants and take off my pants, and I did that. And then he started touching my genitalia. Archbishop Pell was touching himself on his penis with his other hand.”
When it was over the complainant, in shock, pulled up his pants. The boys left the room and tried to rejoin the procession before returning their robes.