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Dade City, Florida -- A man was arrested Wednesday after police say he had sex with a 15-year-old girl he met on Facebook at her home in front of her younger sister.

Detectives say 23-year-old Phillip Evans and the girl messaged each other on the social networking site over the past several months gaining her trust. During that time, they say he never asked her age and on Sept. 9 the two arranged to meet up for sex.

Authorities say the meetup occurred in the girl's bedroom after he climbed in through her window. To make matters even worse, the two apparently had sex in front of the girl's 12-year-old sister.

Deputies say Evans, of Dade City, admitted to the crime after his arrest. He has been charged with Lewd and Lascivious Battery on a Child under 16.