Bradley Kirk Gietz is a pretty sick pup -- not only is he into kiddie porn, he's also into his own son.

Earlier this month, while investigating kiddie porn found outside of Arizona, agents from the Federal Bureau of Investigations obtained several photos of a naked boy under the age of 10. That boy, later identified by his mother, is Gietz's son, who was about 7 years old when the photos were taken.

According to court records obtained by New Times, many of the photos were of the boy completely naked. In others, he had a penis in his mouth. That penis, authorities discovered, belonged to 47-year-old Gietz.

On Friday morning, police interviewed Gietz's son, now in his teens, about the alleged abuse. The boy told detectives that when he was between the ages of 5 and 9, his father would sexually abuse him -- although, he didn't remember his old man taking any photographs. 

Gietz was arrested Friday afternoon, and came clean about abusing his son, taking photos during the abuse, and distributing them across the Internet.

He told police the incidents happened when the boy was about 6 or 7, and on several occasions the two performed oral sex on each other.

Gietz says he took several photos of him abusing his son and posted them on the Internet soon after they were taken. He also admitted to still having the images saved on his computer, as well as several other images of child pornography.

In total, Gietz faces four counts of molestation of a child, 16 counts of exploitation of a minor, and 14 counts of sexual conduct with a minor.