Jayne finds Kaylee in the engine room, and he immediately knows there's trouble. Rather than practically skipping around the machinery like a little girl overdosing on rainbows, she's practically beating the gorram thing into submission.

When she throws her wrench at the hunk of metal, Jayne decides to forget the 'practically.'

"What's the matter with you, girl?" Jayne asks, flexing more than is probably necessary in this situation.

Kaylee looks at him plaintively, the ever present smudge of grease on her cheek smeared further by a tearstain. Jayne begins to regret his gruff bravado. "It's Simon."

Jayne grits his teeth. The mere mention of his name before he started doing the naked tango with Kaylee once made Jayne long for the feel of a shotgun in his hand. Afterwards, the desire leapt up to a machine gun. "Should I go kill him for you?"

Kaylee sighs and sinks to the ground. "Thanks. But no, no you shouldn't do that." She sniffs loudly and drags her forearm across her nose. "He didn't... do anything. He just... I don't feel like he appreciates me. You know?"

Jayne moves forward awkwardly and crouches in front of Kaylee. He pulls a rag from his pocket, and while it's got its own fair share of stains, he decides to hand it to her anyway. "Well, I sure appreciate you, Kaylee. Hell, we wouldn't be able to get this junker off the ground if it weren't for you."

Kaylee smiles and wipes at the grease stain. The rag doesn't do much good - in fact, it actually makes it worse. Jayne thinks she's never looked prettier. "Thanks, Jayne. That's... surprisingly decent of you."

Jayne dips his head, embarrassed. "Hell, I just... just don't like to see you cry is all."

Kaylee makes that noise women make when they see a puppy doing something cute. It sets Jayne's teeth on edge, but then Kaylee leans forward and presses her lips aganist his cheek and he can't remember what he was angry about not just that day, but ever in his life.

"Thanks, Jayne," Kaylee says, handing the cloth back to him.

"Keep it," Jayne answers, too fast and too high. He clears his throat. "I mean, keep it. You need it more than I do."

Kaylee smiles at him again, and while he can’t remember the last time he’s been so happy, Jayne resolves to rearrange the doctor’s face once he’s left.

Hell, Jayne thought, that oughta make this a damn near perfect day.