Prosecutors allege Michael Archacki had "a greed to feed on the innocence" of children when he molested four girls last year.
Archacki's defense team argues the alleged victims' stories just don't add up.
A local jury of seven women and five men will weigh those sides when deliberations begin Wednesday morning.
Archacki, a former police officer and firefighter, is accused of numerous sex crimes last year against four girls.
After five days of testimony, attorneys made closing arguments and jurors heard Judge Dennis Reinaker's instructions on the law.
All that remains is the verdict.
Archacki, 43, faces potential prison penalties that would span his life, if convicted of all charges.
That's exactly what Deputy State Attorney General Daniel Dye urged the jurors to do, in a 40-minute closing argument.
He said Archacki used his reputation as a former cop and firefighter to groom the victims — and their parents — and gain their trust.
Archacki then, according to the victims' testimony, sexually assaulted them during sleepovers and social gatherings at his home in Quarryville.
"Talk about a wolf in sheep's clothing — this is worse," Dye told the jury. "This is a wolf masquerading as a guard dog."
A police badge "for him was camo," Dye said. "The perfect cover."
Archacki, very attentive throughout trial, stared at Dye with furrowed brow, scowling at the prosecutor as he occasionally wiped his face.
Defense lawyer Alan Goldberg, in a 40-minute closing, hammered on inconsistencies in statements the alleged victims made over time.
Details about where the assaults happened and when differed from statement to statement, Goldberg said.
"These events are traumatic if they happen," Goldberg said, while making comparison to the 9/11 terrorist attacks. "You don't just remember the buildings came down. You remember where you were … ."
Goldberg also stressed that the girls continued to have phone contact with Archacki even after they claimed to be abused.
"Does their conduct show you they've been violated?" Goldberg asked. "They're abused, and they come back. Is that logical to you?
"This whole case boils down to credibility."
Tuesday morning, Archacki's fiancee testified that she was aware of numerous contacts he was having with the girls.
Archacki exchanged more than 15,000 text messages with the four girls combined, according to trial testimony.
Angela Faught testified that she knew her fiancee contacted those girls via cellphone. She said she even watched Archacki send some of the messages.
"There was no hiding anything," Faught said. "He was right next to me."
Faught, on direct testimony, said she was "surprised" at the amount of messages, but she thought Archacki was helping the girls with problems.
"That's why I didn't stop it," she said.
Previously, the four alleged victims testified Archacki fondled them last year. One girl said she also was raped. Another said she also was forced to have oral sex.
Faught testified that she knew the alleged victims, and often spent time with them herself. She called life at the Archacki home "normal."
However, through rebuttal witnesses, Dye elicited testimony to the contrary.
Two women testified that Faught told them she was upset about so many girls being at the house.
Faught complained that the girls would be over when she, or her children, weren't there, the women testified.
"She said basically she is (expletive) fed up with this (expletive)," Melissa Rosario testified. "Mike always has girls coming over … ."
Previously Faught denied ever saying those things.
"I said I didn't like the text messages, but I never got all upset about it," she testified.
Finally, Dye asked Faught if she would have been concerned if a 42-year-old man was texting her daughter when she was a pre-teen.
"Yes, I would have," Faught replied.