A plea deal could be in the works for the business partner of a Zumba dance instructor charged with running a prostitution business from her Kennebunk studio. Mark Strong’s defense lawyer will join prosecutors Friday for a settlement conference in Superior Court in Portland. Also up for discussion is a request by Strong’s attorney to withdraw. Strong, 57, is scheduled to go on trial Tuesday on 59 misdemeanor charges of conspiring with Zumba instructor Alexis Wright to run a prostitution business. Defense lawyer Dan Lilley told The Portland Press Herald that he is seeking a settlement that spares his client jail time.