A Pennsylvania man's 21st birthday party allegedly became criminal because the birthday boy is accused of having sex with two 12-year-old girls during the party in Chester County, Pa.

The suspect, Devin Edward Storf, has been brought back to Chester County from North Carolina, where he had moved after growing up in East Whiteland, Pa., according to the Mercury News of Pottstown.

The now 22-year-old Storf faces multiple counts of rape of a child under 13, unlawful contact with minors, indecent assault of a child under 13, involuntary deviate sexual intercourse, statutory sexual intercourse, aggravated indecent assault, and corruption of minors.

The charges stem from an alleged incident at Storf's 21st birthday party last year, according to the newspaper, which adds:

During the June 2016 party, Storf allegedly asked one 12-year-old girl to go into the basement of his family home in East Whiteland.

The girl later told police she went there with another 12-year-old girl ... along with a juvenile male who was friends with Storf.

Storf allegedly began talking to the girls about sex, and "telling them that it was fun." Police say he asked the girls to have oral sex with him.

The first girl told police she had sexual intercourse with Storf and Storf's male friend. She then continued having sex with Storf about 15 more times between June 2016 and March 2017, the newspaper reports, citing court papers.

She told police Storf would sometimes give her alcohol to drink. She said Storf told her not to tell anyone about what occurred because he would get arrested.

The second girl, also interviewed by police, said she had oral sex with Storf at the party.

Storf's underage male friend told police he witnessed the sex acts.

At last report, Storf was lodged in Chester County Prison with bail set at $300,000 cash. He faces an Aug. 25 preliminary hearing.