A key witness took the stand in the federal trial of Sean "Diddy" Combs Thursday, giving graphic detail of choreographed sexual encounters with the music mogul that were allegedly coercive, testimony that's core to the prosecution's case.

The woman, who is speaking in court under the pseudonym Jane, began delivering testimony that is expected to last for days and which so far mirrors descriptions provided by another marquee witness against Combs, his ex-girlfriend Casandra "Cassie" Ventura.

Combs, 55, faces upwards of life in prison if convicted of racketeering and sex trafficking crimes. Both Jane and Ventura are key witnesses to the latter charges.

Jane took the stand after some courtroom drama: the judge threatened to remove Combs after he was "looking at jurors and nodding vigorousl

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