A special education teacher got a sweetheart deal while admitting to having drugged-up sex with a 16-year-old student at her parents’ home at least a dozen times.  Michelle Mercogliano, 36, was sentenced Friday to just 15 months in a Pennsylvania state prison after pleading guilty to institutional sexual assault and corruption of minors, the Chester County District Attorney’s Office. “As part of the plea, Mercogliano admitted that she had sex with, and provided marijuana to, a high school student,” the DA’s office confirmed of the now-fired Conestoga High School teacher. Michelle Mercogliano, 36, was only sentenced to 15 months in prison after admitting to having sex with the student and providing him with marijuana. LinkedIn The now-fired Conestoga High School teacher bought medical marijuana for the boy around 15 times from a Phoenixville dispensary, police said in their initial complaint seen by WPVI .…