The money flowed into Adam Skelos’ pockets from two streams — a real-estate developer that’s also one of New York’s biggest political donors, and an environmental-technology firm that won a contract with his dad’s home county.

Both counted on legislative help from state Senate Majority Leader Dean Skelos, the feds said Monday, laying out a corruption scheme that started with a seemingly innocent 2010 meeting.

At the sitdown were Skelos, real-estate billionaire Leonard Litwin, a top exec at his Glenwood Management, and one of the company’s lobbyists.

Neither the company nor its executives are identified by name in court papers.

During the Dec. 20, 2010, meeting, Skelos expressed thanks for Glenwood’s support of Senate Republicans.

He also “directly asked” Litwin and the exec — who is cooperating with the feds — to pay title-insurance commissions to his son, then repeated the request as they were walking out, according to the criminal complaint.

The exec arranged a $20,000 payment to Adam and also served as a linchpin in getting him hired by AbTech Industries as a $4,000-a-month consultant, the complaint alleges.

Later, the exec “successfully pressured” AbTech to more than double Adam’s salary to $10,000 monthly when father and son threatened to block its $12 million stormwater-treatment contract with Nassau County, the feds say.

In exchange, Skelos is accused of voting for legislation that benefited Glenwood financially and then leaning on Nassau officials to pay AbTech’s bills.

In a secretly recorded conversation with an AbTech exec, Adam allegedly fumed that “the state is not going to do a f–king thing” for Nassau because it wasn’t paying quickly enough.

A spokeswoman for AbTech said it was cooperating with the feds.

A Glenwood lawyer declined to comment.