A Spanish Fork man already in prison on three forgery charges and one burglary charge pleaded guilty in 4th District Court to four reduced charges of sexual abuse of a child, second-degree felonies.

Rodney L. Blackburn, 18, was originally charged with four counts of rape of a child, first-degree felonies. Appearing Friday before Judge Ray M. Harding, Blackburn admitted having intercourse twice each with two 13-year-old girls at party in August.Adult Probation and Parole will do a presentence report and Blackburn will return May 18 for sentencing. He could be sentenced to one to 15 years in prison. He is currently serving four zero-to-five-year sentences at the Utah State Prison.