A WA man who raped a 13-year-old girl after she asked him to buy her alcohol for a house party has had his sentence more than doubled on appeal.

The 22-year-old, who WAtoday has chosen not to name to protect the victim's identity, mostly knew the teenager through Facebook Messenger, although the pair had previously met.

The man had his sentenced more than doubled on appeal Credit:Justin McManus

In 2017, the man was asked by the girl if he could buy her and her friends alcohol for a house party she was having one night while her parents were away.

He agreed and met the girl at her home before walking with her to a nearby bottle shop.