A Kenton woman pleaded guilty to unlawful sexual conduct with a minor, and was sentenced to 30 days in jail.
Investigators said Ceaira Treen moved into her boyfriend's Bellefontaine house last year and started having an affair with her boyfriend's father.
After beginning the affair with James Caudill, the two of them lured a 13-year-old girl into sex.
Caudill pleaded guilty to his role in the crime earlier this week, but had not yet been sentenced.
After serving 30 days in the Logan County Jail, Treen must serve five years if community control, and register as a Tier II sex offender for the next 25 years.
Watch 10TV News and refresh 10TV.com for more information.