The defendants, who cannot be named because of their age, deny all charges against them.
They relate to the alleged attack on the 15-year-old girl on 26 November 2024 and the alleged attack on the 14-year-old girl in the area of Fordingbridge Recreation Ground on 17 January 2025.
The first boy, now 15, denies four charges of rape against the first girl and two charges of rape against the second girl. He also denies taking indecent videos of the second girl.
The second boy, also 15, denies four charges of rape against the first girl and four charges of rape against the second girl.
The third boy, now 14, denies two counts of rape against the second girl.
Ms Mittell said issues in the case would include the girls’ consent and whether video takers or bystanders were guilty of rape by giving encouragement or assistance.
All three boys have pleaded guilty to separate charges of taking indecent videos in relation to the two incidents, the jury was told.
The trial, which is due to last four to six weeks, continues.
