The court heard that Abiola Adenmosun, from Chatham, Kent, approached the teenager when he was 22 and despite learning she was 14 years old, began a relationship with her.
Between 2012 and 2013, Adenmosun gave the teenager drugs, alcohol and sexually abused her several times, typically in his car.
During this period, Adenmosun damaged the teenager’s phone and assaulted the victim’s sister.
In a victim impact statement, the victim said she struggles with anxiety every day and also suffers physical pain.
Solicitor General Ellie Reeves said:
This was a deeply troubling case of sustained sexual abuse by a grown man against a vulnerable child.
I welcome the Court of Appeal’s decision to increase Adenmosun’s sentence and I would like to express my deepest sympathies to his victim who has b