United Kingdom, May 15 -- Sean 'Diddy' Combs' relationship with Cassie Ventura was "integral" to the drug-fuelled sex parties he allegedly forced her to take part in.

The rapper, 55, is on trial on charges including sex trafficking and racketeering and his singer ex-girlfriend made the declaration as she testified on the fourth day of his trial.

Cassie, 33, has been the prosecution's key witness, detailing the abuse she says she endured during their decade-long relationship with Combs, including allegations of rape.

She told them when asked about Combs' "Freak-Offs": "(They were) integral to us."

The trial, which has gripped public attention, focuses on multiple charges against Combs, including racketeering conspiracy and sex traffick...