A Long Island man was busted this week for allegedly raping two 13-year-old girls whom he met on Snapchat.

Brendan Sullivan, 20, is accused of having sexual contact with the teens on separate occasions in March and August, according to Suffolk County police.

He was initially arrested in May on child pornography charges, according to cops — but a follow-up investigation revealed his alleged actions with the two teens.

Sullivan, of Bohemia, was busted around 3 p.m. Thursday in a parking lot on Medford Avenue in Patchogue, cops said.

He was charged with two counts of second-degree rape and three counts of endangering the welfare of a child, authorities said.

He also faces a first-degree criminal contempt charge for violating an order of protection he received during the May arrest for allegedly giving a vape to one of his teen victims.

He was held overnight at Suffolk County’s Sixth Precinct and is scheduled to be arraigned Friday.