Emily it is!

Gwen looked down to the vacant skin on the floor. It was crumpled and flat, but she could make out the empty holes where the eyes and mouth should be. Lilith was right. It was cold up here. It was a deep, bone-chilling cold that no amount of clothes would be able to fix, not that she would want to cover up her incredible succubus body anyway. The suit called to her; when she was within its confines, she would be warm, safe, undetectable. “Guess, I’ll start simple.” She decided.

Lilith nodded, slipping Hayley’s white tank top back on. “I’ll go keep Sara busy.” She turned to the open door.

“But wait!” Gwen exclaimed. “How do I put her on?”

As footsteps approached the door, Lilith gave her a shrug. “You can do anything you want, you decide.” She whispered. Then with a flip of her black hair and an almost imperceptible adjustment of posture back into Hayley’s mannerisms, the succubus stepped back outside, shutting the door behind her.

Gwen could hear the muffled sounds of Emily and Hayley’s roommate approaching. “Hayley, what’s up? I thought I heard somebody talking. And what’s that fucking smell?”

“Oh, that was just Emily.” Lilith said, sliding into Hayley’s speech perfectly. “She’s just doing some weird biology stuff in there, I dunno. Anyway, let me tell you about this hot guy I saw at volleyball practice yesterday…”

With the human girl sufficiently distracted, Gwen’s attention returned to the Emily suit on the carpet. “Can I really become you?” She thought. The new succubus picked it up by the brown hair. Despite looking almost like it should be made of latex, the hair and skin felt totally lifelike. The desire to be underneath was strong, growing ever stronger. But how to get in? She remembered the sight of Lilith sliding her down around an unnaturally extended mouth. That was certainly one way. But the way Lilith had told her she could do anything… What did she mean?

Flipping the skin around, Gwen exposed its bare back. She dug her red fingertips into the pale flesh, smiling when they gained purchase and began to pull apart. Almost as though tearing a roll of dough in half, the skin of Emily easily separated, and an opening formed. Gwen glanced at the inside of Emily’s flesh for only a moment, noting the slightly wet pink interior. The urge to get into this human was almost overpowering.

She spotted the thin tube where Emily’s arm met her shoulder. Almost without thinking, the succubus thrust her hand into that hole. She was met with the bizarre sight of Emily’s arm refilling, the hand underneath her skin working its way downward towards her deflated equivalent. Then, like fitting on a glove, Gwen entered every finger, until her hand matched Emily’s own.

“Huh, a little too big.” Gwen said, examining how Emily’s skin seemed stretched thin over the succubus arm beneath. She spoke too soon. A tingling, prickling sensation followed, as the entire length of Gwen’s arm seemingly moved and shifted of its own accord beneath the skin. When it was done, she looked down and saw a perfectly natural arm, exactly how Emily once looked.

“Holy shit.” She whispered, quickly repeating the process with the next arm. Soon, she could feel both of Emily’s hands as though they were her own, as if there was nothing else beneath.

Now the dark brown hair of the girl’s head stood in her way. Gwen sat back on Emily’s bed, the bed where she had been turned into a demon, and set to work reversing the process in earnest. She stuffed her head under the hood, meeting with temporary darkness as her eyes aligned with their new sockets. With some slight adjustments, she brought Emily’s face onto her own and felt the same melding of sensation, until her face was Emily’s. Again, she could feel the top of her new head poking against her original horns, but quickly things melted and molded, and her horns seemingly disappeared. The entire top half of Emily was now hers to control.

“God damn, these are some nice tits.” She looked down to see her new bust, surprised that it had really changed little from her demonic form. That couldn’t have been the intended effect. What was intended was her sudden change of voice from her husky demonic tone back to the original voice of the girl that had once seduced her to demonhood.

Then Gwen climbed the rest of her demonic form into Emily’s legs, filling the two tubes of flesh with her unholy life. She stood and wiggled her new toes into the carpet, and gasped as the melding of sensation extended to her new human pussy. Across the room, she saw the full-length mirror. There was no longer a succubus and an empty skin—there was only Emily now.

“Wow, she’s--I am so hot.” ‘Emily’ grinned, posing and turning around to check every angle of herself. Gwen had been human less than an hour before, but to become someone else made for an almost entirely new experience. She was about to go put on the discarded sundress on the floor until she caught sight of the opening still on her back, making out a small sliver of dark crimson skin between the two folds.

“Whoops. Better try to close that.” Gwen said, reaching backwards and pushing the skin of Emily’s back together. The flesh stuck together almost instantly, healing and leaving no trace of the demon within.

But scarcely had Gwen sealed herself within Emily before she was bombarded with images inside her mind. The succubus doubled over, clutching her new head as pictures and sounds flooded it. Pictures of a childhood, of going to college, of studying books by night. Pictures of drawing lines on a naked body, sounds of chanting in Latin, the sight of an incredibly sexy creature stepping forth from an impossible portal. These were Emily’s memories, her thoughts, her feelings, her personality and mannerisms. Everything about her. Soon, the bombardment subsided, and Gwen picked herself back up off the floor, her breath heavy with exertion.

Gwen looked back up to the mirror on the wall. Now she saw herself; not the demon she was, but the girl she had become. Her body was filled with the most comfortable and exquisite warmth. “I am Emily.” She spoke. She wasn’t entirely lying.

“…but it was so fucking boring up there. I will never go back to that cabin for three fucking days again, I swear to God.” Sara continued on talking as she unpacked, not noticing her roommate wince suddenly after she…dropped the G-bomb.

Lilith fiddled with her new hair. “Yeah, that sounds like it sucks.” She said, trying to maintain interest in the conversation.

“Anyway, where the fuck is Em? Still cooped up in that room of hers?” Sara asked. Lilith was about to speak up before she noticed someone walk into the room.

“Right here.” ‘Emily’ said, striding in. Lilith could hardly stop herself from staring. The girl before her was incredibly sexy in only the way a succubus could, yet despite her slightly tussled hair and clearly hastily thrown-on blue sundress, there was no indication that she was anything but regular human Emily. The girl gave her a knowing smile before looking back to Sara.

“Emily, what’s… wow.” The blonde girl stopped herself, looking up and down Emily’s clearly enhanced form. “You look… different.”

‘Emily’ shrugged, smiling in her usual way. “Guess I’ve been working out a bit between archeology study sessions.” She plopped down on the bed next to ‘Hayley’.

“Well, I’m gonna go put this in the laundry.” Sara gathered her clothes and left the room, leaving the two succubae to themselves as her footsteps trailed off down the hall.

Lilith turned to Gwen. “You are so fucking hot right now.” She whispered. “I’m surprised she didn’t try to fuck you on sight.”

“I didn’t know Emily was so sexy.” Gwen giggled.

“She isn’t, not normally.” Lilith replied. “That’d be a side effect of you filling her skin. Every form of possession’s got one.” She laid a hand on ‘Emily’s’ bare thigh. “It’s not really possible for us to be completely undetectable.”

“Even your… smoke thing?” Gwen asked.

“Yeah, just smell my breath.” ‘Hayley’ drew in close and let out a huge breath. Gwen’s nostrils were filled with the sweet scent of succubus Essence. It was enough to make Emily’s already damp pussy positively wet with lust.

“Fuck.” Gwen whispered. “And you can’t change that?” Lilith shook her head.

“Well, what now?”

Lilith smiled. “Since it’s your first time and all…”