Make her masturbate without realizing it

Curious to see if the Sapphire can truly make her unaware of what she is doing, you wait until Erica starts pouring herself another cup of coffee, then focus on her again and say, "Masturbate yourself to orgasm. You will not realize what you are doing until either you cum or I point it out to you."

Erica finishes pouring the second cup of coffee, then grabs the handle with one hand while she sticks the other down the front of her sweatpants. She turns and walks slowly over to the table, careful not to spill her coffee while her hand starts visibly working on her pussy.

"Sorry you had to play maid to me," she says casually as she sits down at the table, "I know that probably wasn't your idea of a fun morning."

It takes you a moment to register what she said. Managing to look back up at her face, you grab your cup and make your way to the seat across from her, "Hey, don't worry about it. I'm just glad you didn't hurt yourself."

"Yeah, guess I lucked out there," Erica says, before blowing on her coffee. You start to hear the faint sound of her fingers moving in and out of her wet pussy coming from beneath the table. She seems to be doing a decent job working herself up, though it doesn't show on her face as she asks you, "So, what made you decide to come over? Other than boredom, of course."

"Really, that's about it," you say, pausing a moment to listen some more before continuing, "I just figured the two of us could hang here for a bit, maybe watch a movie or play video games."

"Yeah, that sounds like fun," she agrees, her face going flush. Her breathing noticeably deepens as her arousal rises, and after a moment asks you, "Hey, does it feel hotter in here to you?"

"Huh?" you ask, not really paying attention to the question. The sound of Erica playing with herself is beginning to get louder as her pussy gets more wet.

"I said, is it hotter in here?" she asks again, "I'm starting to feel real warm all of a sudden."

"N-No, I feel fine," you say, gripping your cup a little tighter as you start to get a hard-on, "Maybe it's just the coffee."

"Maybe..." she muses, lifting her own cup up to her lips to take a sip. She sets the cup down slowly, though a sudden shudder of arousal going through her causes her to spill some on the table as she does so.

"God, I'm just so clumsy today," Erica mutters, getting up to grab a paper towel. Once she gets to the roll, she pulls her hand out of her pants for just long enough to tear off a piece before sticking it right back down there and resuming her masturbation session. She walks back, looking at the paper in her free hand with a funny expression, "Huh, it's a little damp. I thought I dried my hands already..."

"Yeah, that is weird," you say, doing your best to stifle a chuckle at your friend's obliviousness.

"What's weird right now is you," she says with a pout as she wipes up the spilled coffee, "You've been acting real odd these past few minutes. Is there something on your mind?"

You think about how you want to answer. You hadn't yet decided if it would be more fun to point out what Erica was doing or wait until she orgasms and realizes it herself, hence why you worded your command the way you did. But with the way her breath was shortening and her hand was starting to move faster in her sweats, you figure now's the time to commit to one option or another, before the choice was made for you.