NORMAN, Okla. – A sailor deployed overseas was sent back to Oklahoma this December.
However, it wasn’t part of a Christmas surprise.
Instead, 24-year-old Brock Mason is facing 11 felony charges after prosecutors allege he sexually abused twin boys in Norman.
"That's shocking," said Andrew Sartain, Mason's friend and former roommate. "Of all the people to think of, I couldn't see him doing anything like that."
Mason lived with Sartain when they were students at the University of Oklahoma last year.
Prosecutors say that's when Mason befriended a single mom of pre-teen twin boys and allegedly began sexually abusing them.
According to court documents, Mason allegedly forced the young boys to have sex with him, perform oral sex and masturbate, in exchange for gifts like cash and shoes.
Mason also allegedly gave the boys drugs and forced them to look at pornography.
Authorities say the single mother of the boys thought Mason was mentoring and helping her sons by spending time with them.
District Attorney Greg Mashburn said, "They think that person's just trying to be their friend and cares about them and so it just gets out of control."
Mason is active duty in the Navy and was extradited from his deployment in Japan back to Oklahoma.
Mashburn says the investigation began after Mason was allegedly caught downloading child pornography onto his computer.
"The NCIS, the naval intelligence, got a tip from a cyber line that some child porn had been downloaded onto his computer," said Mashburn. "So they started digging deeper, started looking at his Facebook, saw some messages with some children here in Norman."
Mason was booked into the Cleveland County Jail on Dec. 1 and was arraigned Tuesday.
His bond was set at $750,000.
While the accusations are hard for his friends to comprehend, prosecutors say the evidence is hard to ignore.
Sartain said, "My first thought would be that he would be wrongly accused because of just knowing Brock. So, I just really want to hear more about what's going on."
Mashburn said, "Rest assured, it's something we'll take very seriously and we look at these cases to make sure the children are kept safe in the future."
The investigation is ongoing and prosecutors believe there could be more victims from Oklahoma and other states still out there.
Mason's next court date is Dec. 17.