A Billings man admitted he made his girlfriend's underage daughters his sex slaves for almost a decade.Franz Joseph Diangson, 54, pleaded guilty in Yellowstone County District Court to six counts of sexual intercourse without consent and one count of sexual assault for crimes he committed against the two girls that began when they were 8 and 10 years old.
The two victims, now age 21 and 27, told investigators the abuse began with inappropriate touching and quickly led to rape.
