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Diddy 's ex-girlfriend " Jane " continued her testimony Friday, saying she was too sore to keep having sex during a freak-off -- which she says sparked a heated confrontation in which the music mogul demanded an apology, after she tossed a bracelet.

Jane -- the pseudonym for one of Diddy's exes on the witness stand -- testified about the shocking incident during Day 18 of Diddy's federal sex trafficking and racketeering trial in NYC, saying it all went down in a hotel room in Turks and Caicos.

She said she was wearing one of her "outfits" for yet another round of freak-off sex ... but she just couldn't handle it anymore.

She said she was too sore at that point ... but says Diddy tried to "lube me up," and he said, "You can't take any more d*ck."

Jane said she threw the brace

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