Paul Collins, of no fixed address, was sentenced at Bristol Crown Court on Friday 21 March for seven counts of sexual activity with a child.
He was jailed for five years and seven months by the judge. He was also ordered to register as a sex offender for life.
Officers attended Collins’ bedsit to arrest him for an unrelated matter, when they found the teenage girl with him.
The victim came to a police station a few days after Collins was convicted of the unrelated matter and told officers she had been raped and assaulted by Collins.