Two Lansdale teenagers have admitted sexually assaulting a 15-year-old Hatfield girl they both knew. 17-year-old Tyreece Lewis of West Hancock Street and 18-year-old Robert Lee of Stony Creek Court pleaded guilty to felony sexual assault without consent Monday in Montgomery County Court. They were 16 and 17 at the time of the incident early last year, but they were charged as adults. They face one to two years in state prison, followed by eight years on probation, when they are sentenced later this year. The Pennsylvania Sexual Offender Assessment Board will evaluate them to see if they qualify as Sexually Violent Predators under Megan’s Law. Court documents say the boys molested the girl in the back seat of Lee’s vehicle while it was parked behind Lewis’s home.