How does she infect Henry and Jess?

Ask Jess to Show Her to the Bathroom.

"I umm... I need to use the bathroom," Mara said a bit sheepishly as she took Jess off to the side. "Can you show me where it is?"

"Of course," Jess said with a slight smile. "We girls can't afford to go alone anyway, can we? The demons will probably go for us first."

"Yeah," Mara agrees, hiding a smile as Jess kisses Henry gently.

"I'll be right back," she says to him.

"ALright honey," Henry said and kissed her back.

Jess took Mara's hand and led her into the back halls of the church. You smiled as you stared at her ass, it was a bit small for your tastes, but you had to admit it was pretty cute. You knew soon it would be a perfect round Succubus ass, but you had to be careful.

Jess opened the door to a ladies room and carefully checked around, checking the stalls. It was surprisingly clean, but Mara knew that was probably to try and dissuade infection. As Jess checked the last of the stalls, Mara used her demonic magic to lock the door and block any sounds.

"Alright, everything's clear," Jess said as she moved back towards the door.

"Thank you," Mara said, now was the chance to make her move.