She's not sure.

After that, you don't know if you could get hard ever again. So you write "Clean" on Stacey, then yourself. You both reverted to your original forms and as your cock shrunk back to normal size, a wave of tiredness struck you. "That was incredible," Stacey breathed. You smiled in reply. "I know. Do you want to something else?" Stacey put her hand on you. "Let's-," she said, rolling over. But as she did, she rolled over into a large pool of cum and yelped, shocked. You got up and helped her up. "Let's get this mess cleaned up. Hopefully we haven't disturbed Olivia too much."

Stacey's eyes widened at the mention of your roommate. "Oh my gosh, I totally forgot about her! I hope she isn't too mad." You laughed nervously in agreement. The walls around here weren't paper thin, but Stacey could get very loud, as Liv had told you shamelessly several times over breakfast. So the two of you quickly busied yourself with cleaning up. Stacey headed for the bathroom to wash off the cum covering her lower, and upper, body while you stripped the sheets and took them to the laundry room. By the time Stacey returned and you had finished covering the bed in clean linens, both of you were too tired for anything more.

So you laid down on the bed and she slipped in next to you, cuddling up against you. "Seriously, that was amazing. We should do that again." You raise an eyebrow. "Really?" Stacey mmmmmmed in response. "Yeah. But maybe not with a cock that big. It felt really good, but honestly, I don't think anything will ever top that in size." She sighed contentedly.

You wrapped your arm around her. "What, do you prefer small cocks now?" In response, she looked up at you and rolled her eyes. "No, I've just, already done that. I don't want to waste time retreading old ground." She wriggled up your chest, climbing partially on top of you. "Let's do something new. Something no normal person could ever do." You notice the mischievous glint in her eyes. "I like it," you say. But what do you have in mind?"

In response, Stacey turned away and lowered her head onto your chest. "I don't know. When I think of something, I'll let you know." You don't reply, just stroke her hair as she relaxes there. Eventually she drifts off to sleep and shortly after, you follow, drifting off to sleep.

Surprisingly, she doesn't think of anything for a while. Honestly, you have a couple of ideas, but they all seem too tame compared to a cock as long as you arm and thick around as a water main. It must be the openness of the exercise, you bet. The marker can do a lot. Since neither of you know what the limits are, she must be suffering from choice paralysis. Besides, for most of those days, Olivia is home early or stays up late, so even normal sex is out of the question.

Finally, three days later, Olivia tells you and Stacey over breakfast that if you want to "spend some special time together" with an exaggerated wink to go right ahead, as she's working overtime tonight. In response, you and Stacey don't acknowledge the joke and finish eating. You try to be patient, but it's killing you. Whenever Liv is eating or looking at her phone, you see Stacey biting her lip and giving you doe eyes. You feel yourself growing hard beneath the table and resist the urge to tap your fingers impatiently. Finally, after your dick has reached the hardness of a titanium rod, Liv gets up, gathers her things, wishes you well and heads off to work.

Immediately, you're both on your feet. You embrace Stacey, crushing her against you, her soft breasts pressing on you. You kiss her sloppily and she returns it, your tongues intertwining for a second. After a few long seconds, she lets go and you both separate to breathe. "I have an idea," she manages to say. At that, your erection transforms from titanium to diamond. You give her another passionate kiss. "I don't think I can wait," you tell her. You have off today, but she has work in an hour. "I called in sick," she consoles you, wrapping her arms around you.

You can't think of anything to say, so you pick her up, bridal style and carry her into the bedroom. She squeals a little at this, grabbing you tightly. You set her down on the bed and start pulling off your clothes. But after a second, she stops you. "Finn," she says, giving you pause. "This one might be a bit weird. Is that okay?"

You're confused for a second, before you realize she's flushing red. She's embarrassed? You think about it for a second, before you realize why. This must be a fetish of hers, something deeply held. You heart is moved by the sight. You kneel down in front of her and take her hands. "Stacey, whatever it is, I'll be here for you. I promise, I won't think it's weird." Stacey nodded. "Alright. In that case, can you look away?"

You give her a confused look. "I want it to be a surprise." She answers, still a little embarrassed. You think about, then decide she hasn't let you astray so far. So you turn your back on her. "Go on. I won't look until you say so."

Stacey stands up, grabs you from behind and kisses your neck. "Thanks." Then she begins to disrobe, taking off her clothes and tossing them past you. You resist the urge to look seeing her sports bra fly past. But you ignore it- soon you'll get to see it plenty. Then you hear the fumbling around with drawers as she digs the marker out of its' hiding place. "Finn," she suddenly says among the creaking of bed springs. "Yes?" You ask. "Whatever you see, don't be shocked okay?" Stacey says. "Regardless of how I look, I don't want you to hold back. I want you to go all out. Be rough."

Then you hear the sound of writing.