Try for the cup, but Sara gets in the way

"Fuck, Sara... I need to give this load to Jenny!" you groan, pulling out from Sara's perfectly shaved teen pussy and grabbing the sample cup off the bedside table.

You point your dick at the cup and start to explode, but Sara dives forward, pushes your hand out of the way and replaces the cup with her eager tongue. By the time you can react, you've already shot a half dozen ropes of cum into the teen's hot mouth, coating her tongue and starting to overflow down her chin.

You catch your last few shots in the cup, and then start scooping your load off Sara's lips and chin. She's simultaneously using her fingers to try to push more cum into her mouth.

"Sara, I can give you more cum later. I need you to spit in the cup so Jenny can take it to the lab. Please."

Sara's eyes beg you to let her swallow but she reluctantly opens her lips and slowly drools your spunk into the sample cup. When she finishes, she licks around the rim of the cup, making sure not to waste any.

"Fine," she says, pouting. She hands you the cup and you screw the lid on. "But you'd better fuck me again before Nikki gets home."

"Of course, Sara. When you need it, I'm here to help."

Jenny knocks on the bedroom door.

"John? What's taking you so long? You need me to come in there and lick your balls, dude?" she yells from the other side of the door.

"Just gimme a second!" you reply as you get dressed.

"Here, I'll help!" Jenny says. Then she starts loudly moaning. "Ohhhhh! Fuck, John! Fuuuuck! Fuck me! Fuck me! Your dick is so big, Daddy! Fuck my tight little Asian pussy! Give me that hot cum! Give me that perfect fucking cumload! Please cum for me, Daddy! Please cum for me! Uhhh! Ohhhh!"

You buckle your belt and open the door, and see Jenny coolly sitting in a chair, one foot up on the table, scrolling through her phone. She's moaning like a whore, but based on her demeanor, she might as well be talking about the weather.

Her eyes shoot to the clear sample cup and she smirks as she stands and takes the cup from you.

"Hey, hey! Nice big load, boss. I guess I really helped. You know," she says as she leans in close and whispers in your ear, "if they had put in the ad that part of my job would be helping you bust a nut, I'd still have applied."

"Yeah, well, I was already done when you started all that moaning. I was getting dressed."

"Sure you were. Don't worry," Jenny says. "I won't tell Nicole that you want to fuck me."

"Jesus Christ, Jenny," you can't help but shake your head and laugh.

"I'll be in touch, boss." Jenny gets her things and heads to the door. "Remember to analyze some of those blood samples. And try not to think about my tight little twat."

"Bye, Jenny," you close the door.

"Is she gone?" Sara asks, a moment later.

You turn and see the blue-haired teen standing naked in the door to your bedroom.

"Yeah, she's gone."

"Does she always talk to you like that?" Sara asks.

"She talks to everybody like that," you respond. "At least everybody in the lab. Not at first. It took her a while to warm up to us."

"She's hot," says Sara. "You should fuck her."