AUBURN — A former middle school basketball coach admitted Tuesday to having sexual relationships with 13- and 14-year-old girls who had lied to him about their ages.

Dyllan St. Peter, 21, will serve no jail time but will be required to register as a sex offender for 10 years.

Originally charged with gross sexual assault, St. Peter pleaded guilty to one count of unlawful sexual contact and two counts of assault as part of a plea deal.

He was sentenced to serve 364 days behind bars but the sentence was suspended.

Investigators said St. Peter, 19 at the time, had engaged in sex acts with the girls between late 2024 and early 2025.

The 13-year-old, it was revealed, had used artificial intelligence to create a fake birth certificate meant to convince St. Peter that she was 16 years old.

Investigators said the relationships began when St. Peter contacted the girls online through Snapchat. Both girls, police said, claimed to be 16 years old.

St. Peter had sex with the 14-year-old over a period of days, according to court records, before she blocked him on social media.

When St. Peter went to speak to the 13-year-old about it, police said, he began having sexual relations with her as well, believing her to be 16 years old.

Police were not convinced that St. Peter had been duped. On New Year’s Eve, it was reported, three people — including the 13-year-old’s sister — informed St. Peter that the girl he was having sex with was underage.

However, when the girl produced the fake birth certificate, police said, St. Peter continued having sexual relations with her.

The older sibling of one of the girls reported the situation to police and St. Peter was arrested by the Androscoggin County Sheriff’s Office in February 2025.

He was jailed after his arrest but was ultimately released on $5,000 bail and has remained free since.

At the time of his arrest, St. Peter had been employed at Fairview Elementary School as an after-school care provider.

At the middle school, St. Peter had been an assistant basketball coach for the boy’s expansion team. St. Peter is no longer working at either of the schools.