Make a drastic change just before she cums

You get a wicked grin on your face as you get an idea too good to pass up. You wait a few seconds for Erica to get started, then creep your way up to her bedroom door. Putting your ear up to the door, you are pleased to hear the sounds of Erica pleasuring herself within. The sounds of Erica's gasps and moans are sexy as hell and getting you horny too, but you push through your arousal and try to focus on figuring out how close she is to orgasm. The timing of this change has to be perfect.

Eventually, you hear Erica's vocalizations get quicker as she begins to reach a crescendo in her masturbation. Right when it sounds like she's about to go over the edge, you focus and loudly say, "Your vagina produces semen instead of normal lubrication!"

Almost immediately, you hear Erica scream in orgasm. Taking that as your cue to get moving, you go back to the couch and pick up the controller, entering an exhibition match with a CPU as fast as you can to make it look like you had been playing the whole time. Just as the match is starting, however, you hear another loud scream come from Erica's room, this time of shock.

You turn just in time to witness Erica's bedroom door swing open. Your wide-eyed friend is standing in the doorway, completely bottomless, and you can't help but see the effects of your change in all of its glory. Her upper legs are splattered in semen, and more of it is oozing out from the slit between her legs. The fingers of her right hand were also dripping with the white stuff, probably from having been in her when the orgasm hit. All in all, Erica has the appearance of a girl whose pussy had been unloaded into by a guy with a full pair of balls, rather than someone who had just finished masturbating.

Erica starts to take a step out of her room, then looks forward and locks eyes with you. Her face goes red in embarrassment, and she high-tails it to the bathroom, slamming and locking the door behind her.

You get up and go over to the bathroom, knocking on the door and asking, "Erica, what's going on?"

"I don't... I don't know," Erica said, clearly flustered and panicking, "I... I think you should leave. Something weird is going on with me, and-"

"Yeah, I noticed," you interrupt, imagining the embarrassment most likely on Erica's face right now, "Look, whatever's going on, I want to help. That's what friends are for, right?"

"Yeah, but this is a..." Erica pauses, then says, "A girl issue. It'd be weird to talk about it with you."

"Weirder than what I've already seen?" you point out, "I mean, if you want to tell someone else about walking around with... that stuff leaking out of you, feel free. But I would at least like an explanation, or I'm just going to automatically assume the most likely scenario, which... uh, isn't very flattering."

There's silence at first, but then you hear Erica sigh in defeat, "Alright, alright, I get it. Just grab some pants off the floor of my bedroom and I can explain."

"Got it," you say to her. You turn and go into her room, which still had a hint of sex in the air. As you grab a pair of jeans off of the floor (damn, her room's messier than you expected it to be), you can't help but smirk as you notice drops of cum on her sheets and parts of the floor. You compose yourself just before you make your way back to the bathroom and knock on the door. Without a word, Erica opens it just enough to reach out and grab the pants out of your hand before closing it again.

After what seems like an unusually long time, Erica comes out of the bathroom with a frown on her face. By this point, you are at the kitchen table again, coffee in hand. You take a sip, then ask her, "So, what the hell was that all about?"

"...Something really weird's happening to me," Erica says, sitting down next to you, "You know how my... um, vagina, was super wet before?"

"Uh huh," you say, amused at how quietly she said the word 'vagina' even though it was just the two of you.

Erica glares at you, and after you wipe the smirk off your face she continues, "Well, I... did what I said I was going to do."

"And let me guess: it didn't help?"

"No, it made things worse!" Erica replies, "Because when I was done there was... well, you saw what there was."

"Yeah, I did," you say, taking another sip of coffee, "What was up with that?"

"I don't know why, but it came out of me after I came," Erica says, too anxious to be subtle, "And the weirdest part is, it keeps coming out! I've wiped in and around my vagina for almost ten minutes trying to get it all, and I can already feel more leaking out."

She squirms in her chair, almost as if to emphasize her last point. You ask her, "Well, this may be forward, but what did you do last night?"

"Nothing you're thinking of, that's for sure," Erica said with another glare, "Besides, it's way too much for me to hold in. And it's... fresh."

You snicker at this, and Erica glares at you again.

"Sorry," you say sheepishly.

Erica's eyes narrow in suspicion, "...Dylan, is there something you're not telling me?"

"What do you mean?" you ask, trying to remain calm.

"I notice you're taking all of this crazy news surprisingly well," Erica says, "Hell, too well. Not to mention all of this started after you showed up. And it's weird that you keep insisting to stay whenever I ask you to leave. It's all really suspicious."

You do your best to look shocked rather than scared shitless, "Wait, are you saying I'm somehow responsible for this?"

"I have no idea how you could be," Erica replied, her tone neutral and steady even as she squeezes her legs together under the table, "But what I'm saying is that if you are causing this somehow, you better tell me. If nothing else, than for the sake of our friendship."

Well, shit.