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An incestuous romance exploded in a gruesome murder-suicide when a Brooklyn man clubbed to death his half sister – who was also his lover – and her two teenage kids, cops said.

Relatives and neighbors who had been trying to reach the family for a week summoned cops yesterday to the Walt Whitman Houses in Fort Greene, where a foul odor emanated from behind the locked door.

Inside, the bodies of Haydee Soto, 42; her 15-year-old son, John James (J.J.) Bordoy, and 13-year-old daughter, Valerie Rivera, were found bludgeoned in three different rooms.

The man believed responsible for the horror, Hector Viera, 34, was on the kitchen floor with a hypodermic needle in his arm, dead of an apparent overdose, police said.

A bloody baseball bat was found in the apartment, and there was no sign of forced entry, sources said.

As detectives tried to pinpoint a motive for the violence, they were also unraveling the twisted relationship between Viera and Soto.

The two were half siblings, with the same father. But cops say they also had a sexual relationship – one they didn’t try to hide from friends and neighbors who frequently spotted them holding hands and kissing.

All that time I thought I was writing fiction, but I guess this kind of thing goes on a whole lot more than folks let on.

New York Daily News: B’klyn bat horror