(Riddle, OR)  --  A woman is facing several charges including rape after allegedly engaging in sexual contact with a teenage boy.  Police arrested 36-year-old Rheta Leanne Melvin late last week after serving a search warrant at her home in Douglas County.  Police say Melvin began messaging the teen on social media and exchanged sexual photos with him.  She then allegedly met up with the teen for sex.  Police believe she may have had additional victims.  An investigation is ongoing.