Clean Up and Cold Shower.

In her post-orgasm lull Emma manages to reel in her desires, at least for the moment.

"What have I done? This is my sister! Little Hannah..." Her conscience returns with a vengeance and she flees the room, leaving Hannah out cold and splattered with cum, but her dick quickly reasserts itself in her thoughts. Her flight from Hannah's room causes the lubed-up meatstick to slap back and forth on her legs, sending blasts of pleasure straight to her brain. "Aaaaah..." she moans, slumping against the wall, her hands immediately grasping her length and squeezing the spongy flesh as it fully erects itself. "How do men get anything done with- Wait. Cold Shower! That's supposed to fix this right?"

Forgetting herself, Emma initially sprints to the bathroom before gasping and slowing her pace as her cock bounces around wildly. She strips out of her nightgown and steps into the bathtub, bracing herself as she turns on the water. "Ai! Oh! Oh, that's cold!" the frigid water certainly distracts her from her newfound appendage but the icy sensation on her warm, sweaty skin is borderline painful. Gritting her teeth she checks to see if her "problem" has been fixed. The blistering cold has indeed caused her dick to shrink to a more manageable size and her nipples have hardened into little points atop her breasts. Her beautiful C-cup breasts...

In just a moment Emma's unstoppable libido bubbles back to the surface even under the freezing water as she is mesmerized by her own perfect breasts. Emma knew she wasn't a lesbian but her new addition made the feminine physique completely irresistible. In a trance she reaches up and twirls her finger around a nub, causing it to harden from a completely different reason. Taking them between her long nails she gasps as she pinches, caresses, and fondles them with abandon. "Don't stop..." Emma only realizes what she's doing when she calls out to her own hand, which has left her breast and returned to stroking her resurrected hard-on. "Argh! What the fuck are you doing?! Control yourself Emma! This is ridiculous." Staring fixedly ahead she concentrates on a crack in the tile till her boner has gone and she is covered in goosebumps.

With some difficulty she clothes herself while resisting her overwhelming sex-drive and stuffs her troublesome member into her panties. She frowns at the sight. Her dick is already stretching the material to its limits. "I'll wear jeans over. Just to be safe." This was easier said than done, cramming her burgeoning manhood into the confining material without injuring herself (or stimulating herself) took longer than it should.

Now that the offending rod was out of sight Emma did her best to keep it out of mind. This backfired almost immediately as she considered what she had done to her sister. Feeling incredibly guilty she slipped back into her sisters room where Hannah still slept soundly, back covered in cum, her legs hanging off the bed, and her ass raised invitingly in the air. The tightness in Emma's Jeans instantly became painful and she worked quickly to right her sisters bed and clothing. She wiped her back clean with tissues and was about to do the same for her cute little butt but...wouldn't it be a shame for her glistening buttocks to be...not glistening? Feeling naughty and grimacing at the tightness in her pants, Emma pulled up her sisters cum-soaked panties and wiggled them deep into Hanna's ass-crack. She forces herself to flip Hannah over, pull up and button her jeans and shirt.

After she finished she realizes she still hadn't replaced Hannah's bra. "Uh... Hannah's a free spirit, she probably won't notice that she isn't wearing a bra just this once." As Emma's conscience made dubious excuses, she couldn't help but feel excited to see Hannah walking around without a bra.

Grabbing the bra and quickly leaving her sisters room before her lust undid all her hard work, Emma considered her next move...