Morseman faces five years in prison after the Contra Costa County district attorney’s office charged him with four counts of "sexual activity with a confined consenting adult."
But one woman says she and her cellmate never consented to having sex with Morseman, which amounts to rape.
And Moresman paid $300 to one victim's jail commissary account keep them quiet.
A spokesman for the Contra Costa County Sheriff's Office confirmed a transfer of funds.
"Then he grabbed me by my shoulder and put me on my bed and had vaginal sex with me," one victim, whose name hasn't been made public, told the SFChronicle.
"He didn’t say anything. He didn’t voice anything. But I felt like, if I were to push him, that he would get me for assault on an officer."
She said Morseman didn't use a condom.
Morseman admits to having sex with both inmates, but says it was consensual.
Now he is charged with four felonies, but they carry a maximum of five years, allegedly committed on March 31 at the West County Detention Facility.
Neama Rahmani, an attorney representing the two women, said he's disappointed with the charging decision calling it a "non-consensual sexual encounter" between the deputy and the inmates.
"I wanted to say so much, but nothing was coming out," his client recalled.
"I was just scared, and just wanted it to hurry up and get over with."
The woman said her cellmate told Morseman he needed to get out of the cell or other deputies would coming looking for him.
She told him to leave at least three or four times.
Morseman ejaculated on the floor, adjusted his pants and walked out of the room, leaving the door open.
The victim turned on the lights then used a sanitary napkin to wipe the floor and put the napkin inside of a plastic bag the jail uses to issue toothbrushes, toothpaste and combs, the woman told the Chronicle. They later turned this over to an attorney who met them at the jail.
Morseman poked his head back inside the women's cell an hour later, she recalled.
"Please don't tell anybody," he told her.
"I don't want to get into trouble."
The women remained silent.
"What do I have to do for you guys to be quiet," the women said he asked.
Their demand: Cigarettes, a lighter and $500 on their jail commissary accounts.
The woman said Morseman deposited $300 into her cellmate's account, but no money in hers.
"This is very serious conduct," assistant district attorney Phyllis Redmond said after reviewing the evidence.
"We filed based on what we can prove to a judge or a jury beyond a reasonable doubt."
"Obviously [in] a confinement situation in a jail, there is an imbalance of power," Redmond said, adding Morseman's actions were an "abuse of authority."
Redmond attempted to raise Morseman's bond to $200,000 at his first court hearing on May 7, but a judge ruled he will remain free on the $100,000 bond issued after he was arrested on April 4.
Morseman pleaded not guilty at his hearing.
Contra Costa Superior Court Judge Benjamin Reyes II set his next court date for mid-June.
Rahmani has filed a civil rights lawsuit on behalf of his clients.