A former teacher at two Boston schools is facing child pornography charges after he allegedly had an online relationship with a 15-year-old, according to the feds.

Quincy man Carter Peaseley, 40, has been arrested and charged with possessing and receiving child sexual abuse material.

He was previously a teacher at the John D. O’Bryant School of Mathematics and Science and the Match Charter School — with both schools in Boston.

Peaseley for about a year was allegedly involved in an online relationship with a 15-year-old, according to the Massachusetts U.S. Attorney’s office. He allegedly told the minor that he wanted to teach them how to kiss, among other sexually explicit activities. He also reportedly stated he wanted to visit the minor.

“Peaseley allegedly instructed the minor not to save his texts and suggested they should use a different platform,” the U.S. Attorney’s office said in a statement.

“It is further alleged that Peaseley and the minor exchanged photographs which included sexually explicit photos of the minor,” the feds added.

When police searched his residence, they found about 243 images of child sexual abuse material on a computer and cellphone, which they seized.

Peaseley was charged with possession and receipt of child pornography.

He was arrested last week and released on conditions, including: a curfew, electronic location monitoring, and an order not to have unsupervised contact with children.

The charge of possession and receipt of child pornography has a mandatory minimum of five years in prison and a maximum sentence of 20 years in prison, five years and up to a lifetime of supervised release, and a fine of $250,000.