(Portland, OR) -- A Gresham man is facing nearly two decades behind bars for sexually abusing two girls. A judge sentenced 31-year-old Tyler Wilkerson yesterday to 18 years in prison. Wilkerson pleaded no contest and was convicted of nine counts of first-degree sexual abuse along with six counts of second-degree sexual abuse and one count of second-degree attempted rape. Prosecutors say he abused two juvenile sisters in 2013 after befriending their mother and being allowed to stay with the family at their home.