She does want Jessica to stay a bit longer

"You're absolutely welcome to stay if you like," said Emily, looking at every inch of Jessica's naked body with a growing sense of lust, "Your body really is a work of art, my dear!"

"Thank you!" said Jessica, smiling wickedly, and batting her eyelashes, "So, what do you want to do with me?"

Emily gulped before responding.

"Oh lots of things..." she said, "All of which would get me fired if we were caught!"

They both giggled.

"Such as...?" Jessica asked teasingly.

"I'm not saying!" said Emily.

"Go on..."

"I don't want to give you ideas, Jessica, sorry," said Emily, before changing the subject, "What are your plans for this evening?"

"Well, professor, as you might have noticed, I'm really rather horny after all of this," said Jessica, giggling, "So honestly I will probably just go to my room and masturbate!"

"Interesting..." said Emily, looking as though she just had an idea, "I wouldn't want to stop you from dealing with those urges, so feel free to do that."

"Oh," said Jessica looking disappointed, "I thought you said you didn't want me to leave yet?"

"I don't." Emily winked as she said it.

"Ohhhh! You want to me to...? Here?!" Jessica said, clapping excitedly, "Ok!"

Emily giggled.

"Take a seat, my dear."

Jessica returned to the seat she had been sitting in earlier, in front of Emily's desk. The art teacher leaned forward and rested her elbows on the desk, in order to get a better view.

Jessica spread her legs as wide as she could, and reached her right hand slowly down towards her pussy, until she was just lightly touching it. She began to slowly massage her clit, and bit her lip as she looked into her teacher's eyes.

"Is this what you wanted, professor?" asked Jessica, while continuing to masturbate.

"Mhmm!" Emily nodded, before absent-mindedly licking her lips.

Jessica couldn't believe what was happening as she rubbed her pussy in front of her teacher, but even so, she couldn't resist trying to push her luck a bit further.

"You know, professor - Ugh! - your wife did give you that free pass..." Jessica began.

"I know, but I'm not going to touch you today," said Emily, "I like watching - it gets me off."

"Oooh, that's good to know," said Jessica, "I think we're a good match then."

"I agree!" said Emily, as they both giggled.

Jessica gently grabbed her tits with her free hand while continuing to masturbate as she felt an orgasm building inside her.

"I'm about to cum, professor!" Jessica gasped.

"Mmmmm, I can't wait to see you do that!" said Emily, licking her lips again.

"Ugh! I'm really really close!"

"Go on, cum for me, Jessica," said Emily, with a glint in her eye.

The instruction pushed Jessica over the edge.

"OH MY GOD - UGHHHHH! I'M CUMMING!" Jessica gasped as she felt her entire body shudder into the best orgasm she had ever felt.

"Mmmm, thank you, Jessica, that was quite the show!" said Emily, smiling at Jessica as she caught her breath.

"You're very welcome, professor, that was so much fun!" said Jessica excitedly, "That was honestly the best orgasm of my life!"

"Really?" asked Emily, "I take it that none of your sexual partners have been very good then?"

"Ummm..." Jessica blushed again, "I've never really had any sexual partners."

"Wow, how on earth does a young woman as stunning as you get to 19 without having sex?" asked Emily, looking genuinely confused.

"Well, this might sound ridiculous, given that I'm sitting here completely naked and just masturbated in front of you," said Jessica, "But, I've always been kinda shy!"

"Strangely, I know what you mean," said Emily, "but I'm delighted that you aren't shy about your body, at least!"

Jessica giggled, "I'm glad about that too!"

"Ok, it's about time that I need to go home," said Emily, rising from the seat behind her desk, "So I'm afraid you will have to head off now too."

"That's ok, professor," said Jessica, "I'll see you this weekend for our next class!"

They said their goodbyes, and Jessica wrapped herself up in her coat before walking back to her dorm room.