The man boarded the bus and sat down beside the girls. He immediately exposed himself and began masturbating until he reached the point of ejaculation.
He then proceeded to smear semen over both the girls and the seats of the bus.
The 21-year-old has been charged for a total of four cases of sexual molestation and one assault.
Aside from public masturbation, he is also accused of having groped several young girls.
He has been detained in custody since the end of April and has admitted to the crimes of which he is accused.