INT. SERENITY ENGINE ROOM

Kaylee is lying on her back beneath one of the engine mounts, working on some exposed wiring.

River slinks into the engine room, running her hand along Kaylee's hammock, then along the wall as she approaches Kaylee.

RIVER: Hey.

Kaylee jumps, then smiles at River.

KAYLEE: Oh, hey! What's up?

RIVER: I just wanted to watch you work.

Kaylee looks surprised.

KAYLEE: Oh... okay. Not much to watch. Just organizing the coolant circuitry.

RIVER: That's okay. (sits cross-legged on the floor near Kaylee) It's very calming in here... with you.

This is very pleasing for Kaylee to hear as she resumes her work, beaming.

River reaches into Kaylee's toolbox and removes a wrench. She twirls it between her fingertips, testing its balance, seeming to enjoy the reflections it causes. She then sets it on the deck and removes another. Within a minute, she's emptied the toolbox and lined up the tools in a perfect pattern on the floor before her. Her movements are absolutely silent, the tools touching the metal deck without a sound.

Kaylee has been focused on her work and oblivious to River's actions. She instinctively reaches into her toolbox to find it empty. She looks over at River.

RIVER: (hopefully)What tool do you need?

KAYLEE: Um, well, I could use my spanners.

River hands Kaylee the necessary tool. Kaylee smiles her thanks and reaches both hands back up into the engine mount.

River silently rises and finds a rag and bottle of degreaser in a wall bin. She begins a thorough cleaning of Kaylee's tools. This Kaylee notices.

KAYLEE: Oh, sweetie, you don't have to...

RIVER: I don't mind. (gazes serenely at the engine) You keep the heart of Serenity beating. You give her soul its glow. (she polishes a screwdriver, then twirls it like a sai) I know what I'm getting you for your birthday.

KAYLEE: But how do you... Oh, yeah. Duh. (sweetly, innocently) So, you gonna tell me?

RIVER:(smiling coyly) Can't ruin the surprise.

KAYLEE: Well, it was worth a