Make her vagina always wet

Curious to see if the Ruby can alter more than just her appearance, you wait until Erica starts blowing on her coffee, then focus on her again and say, "Your vagina is now always as soaking wet as it would be if you were incredibly aroused, no matter how horny you actually are."

The moment you stopped talking, Erica suddenly and visibly shuddered. Masking your amusement under a show of concern, you ask her, "You okay?"

"Y-Yeah," she replied, her face going slightly red, "Just a little cold in here is all."

"Well, drink some coffee. That'll help," you tell her.

Erica nods, then takes a sip of her coffee. Other than the momentary shiver (which you were pretty sure was not due to the cold), you don't notice any immediate changes come over Erica. Still, the hair color change wasn't instantaneous either, so you resolve to be at least a little bit patient.

"So, what made you decide to come over?" Erica asks as she sets her coffee down, cupping the mug in her hands, "Other than boredom, of course."

"Really, that's it," you say, watching your friend intently, "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 says, and you notice her squirm a bit in her chair, "I'm totally down for a couple rounds of Mortal Kombat if you're interested in getting your ass kicked."

"Are you sure that's what will happen?" you ask with a smirk, "Because if I remember correctly, I won best 3 out of 5 last time we played."

"I was just having an off day," she said with a grin of her own, "You won't be so lucky today."

"Is that so?" you say, "Why don't you fire up the Playstation and we can see who's really better?"

"Oh, you're on!" she says excitedly. As she braces herself to stand up though, you hear a very soft squishing sound. Erica seems to hear it too (or feel it), as she pauses and gets a look of shock on her face.

"What's wrong?" you ask her.

"N-Nothing," Erica replies, sitting back down as her face starts to go red, "Um, actually, I'm not feeling too well all of a sudden. You should go."

"Oh come on, don't tell me you're chickening out," you tease her.

"I'm serious, Dylan!" she snaps, "We can hang out another time, I just... I can't right now."

You frown and lean forward on the table, "Okay, what's going on? A second ago you were all ready to go, and now you can't wait for me to leave. Did I say something wrong?"

"No, it's not you!" Erica says, "Really, I just... I only realized when I was standing up that I... um, was feeling sick."

"Erica," you tell her sternly, "Come on, tell me what's wrong. Whatever it is, I want to help."

Erica is silent for several seconds, then asks, "...Promise you won't laugh?"

"Cross my heart and hope to die."

Erica gulps, then pushes her chair out and stands up. You have a hard time keeping your promise not to laugh. The crotch of her sweatpants are completely soaked, and you can see her juices have started tricking down her inner thigh as well. What's more, now that she's standing, the scent of sex is beginning to waft through the air.

"Did you... wet yourself?" you ask her.

"No!" she says defensively, her face going redder, "It's not pee, it's... well, something else."

"...Cum?" you ask her, trying and failing to stifle a guffaw, "Wow, I didn't realize I made you so horny."

"You don't!" Erica shouted, now getting very flustered, "I mean, not that you're ugly or anything, but this isn't..."

You snicker at her stumbling over her own words, and she glares at you, "You promised not to laugh!"

"Sorry, sorry," you say, regaining control of yourself.

Erica sighs, then says, "Okay, well anyway... I don't know what it is. I'm not horny or anything, but it's like my... um, girl parts, have a mind of their own, and are all revved up and raring to go."

"Okay, that's weird," you say, "Are you sure you don't need to... you know."

"That's why I was trying to get you to leave," Erica said, looking off towards a wall in shame, "Well, that and I didn't want you to see me like this. It's... really embarrassing."

"I bet," you say, then give her a sympathetic smile and say, "Look, why don't you go to your room and... well, do what you have to do. I'll set up the game and play some single player while you're gone, and once you get back we can play and forget this whole thing?"

Erica doesn't respond at first, so you add, "I mean, I'll leave if you really want me to, but if you need help I'd rather be close enough that you can come get me without going outside."

"I won't need your 'help'," she says defensively.

"Not what I was talking about," you assure her, "I meant if you think you need me to go get something. I doubt you would want to go out in public if this is really going to be an issue."

After a few more moments of thought, Erica sighs in defeat and concedes, "Okay, yeah, I get what you mean. I'll, um... I'll do that."

She turns to head off to her room, and you can't help but notice that the large wet patch of cum had spread to cover the bottom of her butt as well. Erica stops to adjust her waistband, then looks over to you and adds, "Um, if it's not too much trouble, there's a headset underneath the TV stand. You, um... may want to use that if..."

"Don't worry, I won't hear a thing," you tell her.

Erica looks uncertain if she can trust you, but with no other alternative, she goes into her room and shuts the door. A second later, you hear the lock click into place.

With Erica gone, you break out into a grin and hold the ruby amulet in your hand. You're amazed at how well that all worked out, and you feel like playing with it more. After all, as long as you remember to fix everything before you leave, it's not like anything you do will be permanent. There might be some real fun to be had, whether its with Erica or someone more deserving of your changes.

You also realize that even with her door shut, Erica could probably still hear you if you went up to the door and spoke through it, meaning that you could use the Ruby to make her time in there more interesting than usual, even if you wouldn't be able to see it. Then again, do you really want to violate your friend's privacy like that? Maybe you should do what you said you would and play video games until she comes back. Then you could either undo your change and explain what is going on, or just mess with her some more where you can actually see her.