In an exclusive interview with In Touch magazine, on newsstands now, Miami rapper Stitches (real name: Phillip Katsabanis), claims he had sex with Kylie Jenner just weeks after her 18th birthday.

In the video interview with In Touch, below, Stitches explains exactly what happened between him and Kylie.

“I did cocaine with Kylie and then slept with her — while she was in a relationship with Tyga,” the rapper, who described their encounter in a raunchy new diss track, revealed. “And if Tyga has one problem with anything I gotta say about his girl, he can come see me whenever he wants. I’ll beat the s— out of him.”

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Shortly after being introduced by his friend, rapper InkMonstarr, they met for a date and one thing led to another. “I had sex with her. We did it all,” Stitches, who says he has "proof" they had sex, explained.

“[We did] some drugs. She called me ‘Daddy,’” says the rapper. “She didn’t bring up Tyga, not one time. She did not seem remorseful, not one bit.”

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But when she later blocked his calls, Stitches took revenge. The rapper, who has an AK-47 tattooed on his face, recorded and posted the diss-track video called “Kyga She’s a Liar” with InkMonstarr on Sept. 10, in which he insults his enemy Tyga and spills the X-rated details about his sexual exploits with Kylie.

“I thought it was a good idea to come at her ’cause, I’m not gonna lie — she ignored me after that day we had sex,” Stitches tells In Touch.

kylie and tyga

Stitches says Kylie’s boyfriend “already had his managers contact my managers and say that if we didn’t take the video down it was going to result in violence,” says Stitches. If Tyga comes after him, “it’s like a death wish,” he warns. “I will stomp him the f— out."

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This isn't the first time Kylie has been tangled up in the dangers of Tyga’s world, where violent feuds are the norm. “It’s a dangerous crowd,” a Tyga source notes. Adds another source: “She’s reckless and puts herself in risky situations.”

For the full interview with Stitches, and more details inside Kylie’s dangerous double life, pick up the latest issue of In Touch magazine, on newsstands now!