Go on your knees and reward her while she finishes the job

You get up and look at Jessie, then you go down on your knees and kiss her shaft. She grins at you.

"I thought the reward was for after I finished my job."

You stare back at her and retribute the smile, bitting your lips.

"Might as well start it while you do it. You've earned it." You answer, putting your lips around it's head and taking as much in your mouth as you can in one go. You decide since this will be the last time you do this, after all, you're going back to being {firstname} after this, you'll do it properly.

You pull Jessie, making she stand up, you think about the the feeling of the cold white tiles of the lab floor, nothing like the warm carpet you were just imagining, as you go under the desk, positioning her at the keyboard. You put her cock inside your mouth again, hearing she moan.

You take it out and look up, making a pouty face. "Don't just moan... Call my name... I'll miss hearing it..."

You hear a moaned "{girlname}..." along with the noise of the old computer keys. You smile and still looking at Jessie's eyes take her penis in your hands and kiss it. You tease her a little, kissing and licking lightly without putting it inside your mouth. After realizing what you're doing she lashes out, in a mix of demanding frustration and playful lust "Quit playing around and fucking suck it" grabbing the back of your head and thrusting in.

That makes you moan and start sucking it willingly, to which she responds with a "Now you're behaving like a good slut {girlname}" that sends a heat wave from your crotch up which incites you to take more of her penis in, feeling it's head hit the back of your mouth. "You like being called a slut? Is that because you're a slut {girlname}?" You moan an affirmative and displace your blouse and bra, deciding to play with your nipple.

"How about bitch? Are you my little bitch {girlname}?" You don't even bother confirming again, you're just so aroused that you give up taking it slowly, you need her to come in your mouth now. You recklessly shove your face towards her, you feel her cock slidding inside your throat, you gag and pull back, but determined to not be stopped by it you lunge forward again, you feel yourself gagging again, but manage to hold your breath concentrate and relax your throat.

When you feel your lips at the base of her cock and it's interety inside your mouth you stop and hold it there for a moment. You hear Jessie moaning "Two days and you're already a better cocksucker than most {girlname}, very eager too." You feel another pulse through your body, you start moving your head in response to the compliment and feeling Jessie's body shaking in response, you're about to get what you want.

And after this you're definitely getting fucked again.