Sure

She screams out for help, over and over again. Only a short while later, the crew shows up, and looks at her. Mal, River, Simon, Jayne, and Zoe (Wash is flying the gorram ship and Inara is busy fucking some client's brains out). "Is something wrong, Kaylee?" Asks Mal.

"Mal, I was just fucked by some, some, some space ghost." Kaylee responds incredulously. "How'd you figure?" Questions Mal. "I'm naked and I felt my ass get fucked by this invisible ****?" "Kaylee, I dunno. You are sometimes wont to just take off your clothes. Remember that time when we walked in and you were screwing yourself on a dildo that you'd glued to the engine?" Mal counters.

"I'll be in my bunk" say Simon and Jayne at the same time. Zoe rolls her eyes, and the two leave. River cocks her head, as if she didn't understand. Kaylee's eyes are wide, "You people don't believe me? Look at this!" She reaches behind her, and sticks a few fingers into her butt. Mal cringes. "Kaylee?" She pulls her fingers away, and holds it forward, showing a stand of cum attached to it. "LOOK AT THIS MAL! WHAT THE FUCK IS THIS?" "Kaylee, your finger is totally clean." Mal turns and walks out. "Don't waste our time."

Now there is just River, Zoe, and Kaylee in the room. Your hack has worked well, preventing the others from noticing that anything is wrong with Kaylee