The perpetrators allegedly yelled at their victim, "You raped her!" He responded, "I didn't do that, I didn't do that."
But the pair believed Williams, and continued to punch the victim, McGinnis said.
The victim was then "violated with the mop stick repeatedly over time," undergoing nearly 24 hours of torture, according to the victim and police.
Williams, of Church Street near Penn, and the 16-year-old, of Granite Street near Torresdale Avenue, were arrested and charged with aggravated assault, robbery and related crimes, McGinnis said.
Police have a warrant out for Aiken, 20, of Moyamensing Avenue near Moore Street. Authorities ask anyone who knows of his whereabouts to call Northeast Detectives at 215-686-3153.
McGinnis said that police still don't know why Williams came up with the plan. She gave a rape motive to acquaintances, Aiken and the teen, but never told any friend that she had been raped, he said. She did not report it to Philadelphia police, he said.
The victim told police that he never raped her, but that the two had argued the week before.
Williams told a few friends that the man had threatened to lay hands on her, McGinnis said, but the victim denied this as well.
"She was apparently really mad at him," McGinnis said.
About 10 p.m. Sunday, Williams called her sex partner of six months to her Frankford home and enticed him with sex, McGinnis said. While they were having sex, she excused herself to let in the two males, McGinnis said.
Aiken and the teen rushed in and apparently began to beat up the Northeast man with their bare hands, but it escalated from there.
At some point the males tied the man to a sofa with extension cords and began to strike him with the wood plank, electric cords and a mop, the captain said.
Their purported deeds grew more atrocious. The thrashing from the wood plank left the victim with open wounds, McGinnis said. Aiken and the teen then poured Clorox bleach and ammonia over the man, causing stinging sores.
Then the duo took Pine-Sol floor cleaner to lubricate the mop and sodomize the victim "several times" over the time he was held by the trio, McGinnis said.
The ordeal ended only when Williams' roommate, who owns the house and rents to her, arrived at 8:40 p.m. Monday and interrupted the alleged criminal activity, he said.
The roommate tried to call 9-1-1, but Williams and her pals tried to prevent her, McGinnis said. The woman escorted the naked, disoriented victim outside the house where he fell to the ground. A few minutes later police arrived and took him to Aria Health - Frankford campus.
Detectives didn't immediately ascertain the extent of his injuries or the nature of the crimes because doctors had to treat the victim, McGinnis said. It was sometime during the night that they learned how serious the victim was injured.
Police had wanted to take the man to Episcopal Hospital where many rape victims go, but doctors felt that it was unsafe for him to be taken anywhere, McGinnis said.