Ishola Adeyomi Adeoye, aged 26, from Bermondsey met a 14 year old girl in Plumstead in October 2010 and took her back to his home in Woolwich. Fully aware of her age, he gave her alcohol, waited until she passed out and then raped her.
The victim awoke in the morning and was not aware of what she had been subjected to. Later that same day, having returned home, she began to feel pain and realized that something may have happened. After making a report to the police, a DNA test proved she had been raped.
Officers from the Met's Sapphire Command at Bexley launched an investigation and the DNA profile taken was matched to Adeoye.
He denied ever meeting the victim but changed his evidence during the trial, admitting he knew her but still maintaining his innocence.
Detective Constable Pete Thompson said: "This was a horrendous act committed against a vulnerable 14 year old girl.
"Adeoye tried to deny the offence and when the evidence against him was so strong he ended up changing his account.
"The jury clearly saw through his lies and I am pleased with the sentencing result.
"The victim showed a tremendous amount of courage and bravery to give evidence against the defendant.
"I hope that this result can go some way in helping both her and her family come to terms with what has happened."