The Connecticut house of horrors mom accused of imprisoning her stepson in foul conditions for decades rejected a plea deal to serve only 10 years in prison — as the victim’s biological mom blasted the alleged abuser’s attorney for acting like a show pony.

Prosecutors reiterated an offer that Kimberly Sullivan, 57, be sentenced to 30 years behind bars, suspended after 20 years served, during a 90-second court hearing in Waterbury on Wednesday.

But Judge Corinne Klatt sweetened the deal by suggesting Sullivan serve 30 years, with the sentence suspended after 10 years.

But Sullivan’s defense attorney, Ioannis Kaloidis, said she’s completely innocent.

“I don’t anticipate this case resolving with anything that involves incarceration,” Kaloidis told reporters. “Kimberly’s done nothing wrong. She’s been surprised that any of this has even occurred.”

The attorney added that he hopes to discuss a trial date for Sullivan at her next court date on Sept. 4.

“Whether you’re in Waterbury or Bridgeport, people know about the case. The key is going to be finding jurors that are not swayed by sensational media coverage, outlandish allegations, or sympathy that they may feel for the person making the allegations,” he said.

Sullivan was mum as she left court in multicolored striped pants.

She is accused of keeping her stepson – now 33 – locked in a filthy room in their Waterbury home beginning when he was around 10, only letting him out for a few hours so he could do chores.

The stepson – known publicly only as “S” — weighed just 68 pounds when he was discovered in February 2025 after he apparently set fire to his room in a desperate escape attempt.

S soon told police terrifying tales of alleged abuse, including being taken out of school as a boy, before being relegated to the upstairs room that allegedly became his prison-home for decades.

The alleged wicked stepmother was arrested within weeks, but sprung free on $300,000 bail while being ordered not to contact her stepson.

Sullivan is facing a slew of charges, including two counts of first-degree kidnapping, first-degree assault, first-degree unlawful restraint and intentional cruelty to persons.

Tracy Vallerand, S’s biological mom, blasted prosecutors for offering the cushy plea deal and referred to Kaloidis as “Beavis” of the sitcom “Beavis and Butt-Head.”

“He is just in it to get his face in the news, on camera, saying ‘Hey, look, I represent the f–king worst of the worst,” she told The Post.

“Unless they’re actually talking about 31 years of her life, I don’t want to hear it,” she added, noting she believes her son was kept in a cage for 31 years based on details of the case.

Vallerand gave up her son when he was just 6 months old and left his father, Kraigg Sullivan, to raise him with his new wife, Kimberly.

She said it “kills” her every day to not know more about her biological son’s condition or whereabouts.

“I know nothing. I absolutely know nothing. And it’s frustrating, it’s very frustrating. It kills me every day,” Vallerand said.

“I’m also concerned with his development, his physical therapy, his mental therapy, everything. I know absolutely nothing. I know he’s going to be f–ked up for years and years and years, and it kills me.”