On a 7-9, she'll do it if you turn her on

Lucy hesitates, swaying between walking into the room and running away. You'll have to handle this delicately.

You gently guide Julia's mouth back to your cock, and though she's blushing from being watched by her friend she starts to suck you again, slurping up the cum still dribbling from your tip.

"Julia was just helping me get a little relief. It's nothing to worry about, all the teachers do this."

You stroke Julia's hair and give her a warm smile.

"And doesn't she look pretty like this?"

Julia blushes and looks to her friend, a thick string of your sperm across her face and a gooey mix of cum and spittle hanging from her chin. She pulls her mouth off your cock, still stroking you.

"It's okay Lucy, really. It's nice. Come and try it."

Lucy takes a hesitant step forward.

"O-okay. I guess..."

Julia reaches her hand out to her friend and Lucy steps forward to take it, joining Julia on her knees in front of you.