The 16-year-old was in a relationship with the girl at the time.
In questioning, it has emerged that both he and the girl agreed to always ask each other if they were okay with having sex before they had any kind of interaction.
On the occasion in question, however, it was different and the 16-year-old is now convicted of rape.
Must pay damages
The girl was in a particularly vulnerable situation as she slept during parts of the sexual act.
The incident occurred last summer in Karlskrona municipality.
Blekinge district court sentences the teenager to youth service for 130 hours.
The 16-year-old has denied any crime.
In addition to his youth service, the 16-year-old must also pay damages to the girl of SEK 115,000.