The scene: In the engine room. Captain Mal has just dismissed the mechanic for bringing yet another bar wench on board the Serenity without authorization. Kaylee talks a good game, but the captain is angry. Impressed but needing more than just promises, he puts Kaylee to the test.
Captain: I cannot remember how many times I've told that good-for-nothing gear-head to stop bringing every saucy trollop he comes across onto my ship. But you will be the last. You sound like you know your way around a motor. But I'm going to need to do a proper inspection, I mean, interview before I give you the job. Strip.
Kaylee: But, I...
Captain: Strip or get off my ship.
Kaylee: But I'm already naked.
The Captain stares agog at her stunning perfection: the voluptuous curves of her perfect body, her lush chestnut locks, her gorgeous face, the twin symphonies of joy that are her breasts, her soft belly and slender waist, her long, shapely legs, the perfectly shaved mons and the delicate slit of her pussy.
Captain: Ah, so you are. Impressive. Turn around.
Kaylee turns in place to reveal the plump, smooth and inviting twin globes of her spectacular ass.
Captain: I ain't gonna' lie to you: I like what I see. But we're in the special freight business...
Kaylee: You mean we're smugglers.
Captain: Discrete couriers, please. We do not use the "s" word.
Kaylee: Sorry, Captain.
Captain: I'm prepared to overlook it, just this once. Please mind your tongue.
Kaylee: Yes, Captain.
Captain: As I was saying, sometimes we need to conceal our cargo in discrete ways. Suppose, just for instance, we had a shipment of these special spinward curved, black, twenty three centimeter, ribbed compression coils.
The captain holds up a shiny, black, ribbed silicone dildo with a slight curve to it.
Captain: How many of these do you think you could conceal on your person?
Kaylee: On my...? Oh, I get it. Umm... two? Maybe three?
Captain: That's good. I like that. I think you'll do just fine. Face the engine, spread your legs, and bend over. I'm going to inspect your, umm..., grav thrust.
Kaylee: Yes, Captain.
Kaylee does as she's told and leans over the engine compartment, thrusting her butt up to meet the Captain's exploring fingers.
Two, then three of the Captain's fingers force their way into Kaylee's juicy hole. She groans in appreciation.
Captain: Damn, but you're well-greased. Is this all you, or did that knucklehead fill you up before he left?
Kaylee: He was a two-pump chump, Captain.
Captain: Heh, yeah. I reckon I knew that already. Mmm... salty.
Captain: Well, your main thruster appears to be in order. Now I'm going to check your exhaust port.
With his fingers pressed against Kaylee's g-spot, Captain Mal leans in and drags his tongue across her puckered starfish.
Kaylee: Unhh...
Captain: Very nice.
Removing the fingers from her pussy, Captain Mal rubs their tips against Kaylee's asshole, which flexes appreciatively in response.
Captain: Let's see what one does...
The first digit sinks in easily enough, eliciting a soft murmur from Kaylee's slightly parted mouth. A second follows, and Mal pumps them in and out a few times while Kaylee groans.
Captain: This looks promising. Now two... Yes, that's fine. Very fine.
Three and then four fingers slip in easily enough, needing only the slightest slathering of spit to finish the job.
Having sufficiently lubricated her "exhaust port," the Captain presses the tip of the "compression coil" against Kaylee's dilated asshole.
Kaylee: Aaaahhh... yessss...
Captain: Mmm.. hmm... you like that...
Kaylee: Yes, Captain. Ohhh... please fuck my assssss...
The Captain presses the dildo deeper, deeper, slowly filling her up, until the wide flange of its base presses firmly against her butt, fully inserted.
Captain: There. That just about does it. Keep that there and stand up.