A 54-year-old Houma man was ordered to serve 18 years behind bars after he pleaded guilty to sexually abusing two young girls. Chester Champagne Jr. pleaded guilty May 10 to two counts of molestation of a juvenile under 13 and one count of aggravated crime against nature, court records show. After Champagne entered his pleas, District Judge Timothy Ellender Jr. of Houma sentenced him to 18 years in prison, 10 of which must be served without probation, parole or early release. Champagne must also participate in a treatment program and register for life as a sex offender, Terrebonne Executive Assistant District Attorney Carlos Lazarus said. He must also have no contact with any of the victims during the duration of the sentence.