Better Summary: Magnus gets into an argument with another warlock, who decides to get even by temporarily turning both him and Alec into women. The first couple chapters will be light hearted and appearance obsessed, then the story gets demon hunting bad-ass, and then it ends with two lovely smut sections, one with female bodies (because there isn't enough femme slash out there) and then regular Malec slash. I have the chapters planned, but only the first two are actually written.

A/N: Okay, so generally I'm not one for Gender bending, however I saw another Malec GB fiction and it really, really irritated me for a number of reasons. So I decided to try to write one that would numb my irritation and this is what happened. For the record, Magnus and Alec will be referred to as 'he' 'his' and 'him' for the entire story. Because their gender is between the ears, as it should be. It's just a physical spell, that is all.

Disclaimer: I do not own TMI or these chatacters, they are property of the lovely Cassandra Clare.

Swap, Switch, Slash

Chapter 1

It was a cool, fall afternoon in Brooklyn, but the mood that surrounded one Magnus Bane and his young Shadowhunter Alec Lightwood was even colder. Magnus had made the simple mistake of bringing his boyfriend along with him on the job, the result of which was, to Alec at least, catastrophic. Alec had refused to talk in the cab during the ride back; spite the warlock's many attempts to engage him in light hearted banter. Magnus didn't see the big deal with what had happened, honestly, it wasn't as though he wouldn't be able to fix things. It was actually quite a refreshing experience, and he was enjoying the view, so to say. None the less, the silence maintained until both were back inside Magnus's large apartment. Things were about to get awkward . . . for Alec.

"Can't you do something?" Alec asked quietly, sitting into the couch, hugging his legs, looking uncomfortable in his own skin he continued; "We're not stuck this way, are we?"

Alec, of course, was referring to their current physical states. Earlier in the night, during an argument Magnus was having with another warlock, the other cast some spell that had left both him and his boyfriend in a state of sex swap. Their bodies had taken on physically female traits, right down to the most important bits. Magnus had assured him initially that it wouldn't be permanent, but he had also expressed little care either way, which did little to calm the slightly shorter male.

Magnus was seemingly too busy to answer, the moment he had yanked his now oversized, sparkling, platform boots off he had run into the bedroom.

"Magnus?" Alec called, not wanting to uncurl or move away from the couch.

There was a rustling in the other room, a few banging noises and a startled Chairman Meow came running from the open crack in the door. "One moment darling, I'm just fixing something." Came the warlocks' voice, slightly higher but with an air of androgyny to it.

When Magnus finally re appeared from the bedroom, Alec couldn't help but stare. He was still mad, but it was impossible not to admire Magnus. He had apparently ripped apart his closet looking for the tightest of tight clothing, one pair of skin tight, red leather pants and a black tank top which revealed too much, all held together by a large flashy belt buckle. The clothes were hugging his now, willowy body's, slender figure in a most appealing way. Everything about Magnus was slender and tall, as always. He didn't get much of a chest or hips, just delicate, detailed curves. Magnus, it seemed, would always be Magnus. He had also calmed the spikes in his hair, letting it fall straight, but still it was drenched in glitter that spilled down and over his golden skin. Alec never really looked at girls, but he could still appreciate looking at Magnus.

The warlock caught his boyfriend staring. "You like?" Magnus did an animated twirl. "I'm a little disappointed honestly; I pretty much look the same." He pouted. Clearly he had taken the time to examine his reflection. Alec had no intention of going anywhere near a mirror until this was over. "Though, that is fabulous, so I shouldn't complain." He looked over his boyfriend. "You though darling, what a difference." Magnus said, a little breathless, he whistled before moving to the couch.

Alec shifted, feeling uncomfortable. He didn't like the sensation of being in a foreign body. It felt weak to him, and he had issues to tackle with his own body confidence, never mind being forced into a suit of the wrong gender. He pulled his legs closer into his stomach, trying to form a ball, making it obvious he did not want to be touched.

"So, how long until you find some way to change us back?" Alec asked.

Magnus shrugged. "Not sure, I'll have to read into it. It's not super complicated magic though, so it shouldn't be too hard." He put an arm around his sulking boyfriend. "I, for one, am going to try and enjoy this. It's not everyday you get to look like a new person. Especially for me, I haven't aged in forever, literally, I never change. Can you imagine how that would feel? So I'm going to relish in every second of this." Magnus smiled and ran his hands over the new curves of his body shamelessly. "And babe, you've sort of won the lottery here. I'm seriously jealous, it's taking some will power not to drag you into the bedroom and have my magical way with you and the wardrobe. The things I could do for your curves – " He was cut off.

"No!" Alec said sharply. "I just want this over. I don't want you to see me like this."

"I don't care Hun." Magnus cupped his hand to Alec's cheek. "You're sexy because you're you. Not because you usually have a penis." Alec blushed at the word penis, Magnus rolled his eyes. "Though I do rather like that particular part of you." He muttered to himself, but still loud enough for Alec to hear. "I maintain my status as a free wheeling bi-sexual, so I can totally be into this." He gestures to the whole of Alec's curled body and raised a suggestive, thin, eyebrow. His boyfriend didn't budge an inch, so he exhaled somewhat disappointed.

Alec looked Magnus in the eye, hoping that his discomfort and irritation were evident and displeasing to his counterpart. It didn't work; Magnus smiled, broke contact and stood up quickly, excited by something or other.

"I need to go to the institute!" the warlock announced, raising a finger and wheeling around to bend over to Alec's eye level. Alec paled instantly, his legs falling from their curled position to the floor in his state of bewilderment. Magnus was pleased he had uncurled, regardless of the reason.

Alec's mouth opened and shut a couple of times before he found the corresponding words. "Why would you need to go to the institute?" his voice hitched a new high note during the last word of his question, the sound made him flush.

Magnus was now wandering around the apartment, gathering things into his fuchsia, studded, messenger bag. "You sort of sound like your sister now you know." He smiled, "You look like her too, just more sexy, cause you've still got those amazing eyes, doll." Magnus winked. Alec snorted at the attempted flattery.

"Well, we are related." He looked at his boyfriend, who was now walking towards the door. "Magnus!" Alec called. "Why are you going to the institute?"

"Oh, right, your sister actually. She has some scandalous clothing I would like to try on now that I have the equipment for it." Magnus pulled on his tightest leather jacket and was in the process of slipping on his; now too big, platforms.

Alec stood, finally. "Why don't you just summon things to try on?" He asked, knowing that if Magnus headed for the institute, he would end up following. Alec really did not want to go there.

"Frankly darling, I want to have some fun trying things on. Fashion is always better with an audience." Magnus stated as if it were a matter of fact, and then added. "As much as I do enjoy looking at myself in the mirror, one does not dress this elaborately and not flaunt it."

"I'm here. . ." Alec started moving towards his boyfriend.

"It's not the same; you don't care for clothing. Nor are you enjoying this like I am. I wish you would, but you're not, which is a complete shame because you look drop dead gorgeous, but I won't make you have fun." Magnus was now observing his own reflection in the mirror by the door, seemingly satisfied with his current attire.

Alec was lost for a second, but responded. "I can enjoy looking at you. You seem to be pulling this off well enough." He made the effort to look Magnus over for effect, not that it was hard, the boy was always attention grabbing and far from an eye sore. Even his female figure held a strange appeal for Alec. At the moment he did look rather a lot like a member of 2NE1 though, terrifying, yet sexy.

Magnus closed the space between them quickly, taking advantage of Alec's standing; he pulled them together in a hug. One of Magnus's hands rested on the small of Alec's back and the other then cupped the back of his head, pulling it towards his own shoulder. He could sense Alec tense at the feel of their new bodies in such close proximity, but kept hold. After a few moments Alec released the tension and returned the hug, he sighed.

"I don't want to go to the institute; it would involve having to show my sister and Jace." Alec shuddered at the thought. "I don't even want to look in a mirror, how am I supposed to show them?"

"I'm going." Magnus said firmly. "And I know you well enough to know that you will follow me." The Warlock released his hold, smiling, and turned to stand in the door way. "So, are you going to put a jacket on?"

After another half hour of useless talking and some interesting name calling, Magnus had managed to coax Alec out of the apartment, though coax may not be the right word. The whole thing ended with Magnus running from the apartment in excitement and impatience leaving Alec to reluctantly storm after his boyfriend, without a jacket after all.

Sans jacket, Alec was cold. His body wasn't heating the way it normally did and the air was chilled. The cab driver they had paid to take them to the institute had kicked them out a few blocks early because of the argument, which resumed once they entered the cab. And now Alec was shivering.

Magnus took his own leather jacket off and pushed it over Alec's shoulders, having noticed his situation. The Shadowhunter looked back at his boyfriend with large eyes; "Are you crazy? You're only wearing that tiny shirt, not only will you freeze but it's almost entirely indecent..." Alec started pulling the leather jacket off. "At least I have a sweater." He tried to hand Magnus his jacket back but the sparkly warlock would not take it.

"I'm the high Warlock of Brooklyn; I think I can deal with some cold and wandering eyes." As if on cue, a whistle could be heard from a group of on-looking city workers.

Alec flushed but looked highly annoyed, shoving the jacket at Magnus in a way in which left the other no option for refusal. Magnus turned to look at the workers and began yelling.

"This right here. . ." He gestured to Alec; "He's mine, so get your minds out of the gutter and away from my beautiful boyfriend!" Magnus raised a certain finger and continued walking. The men were making loud, crude noises of collective confusion.

"You do know they were whistling at you right?" Alec asked in a small voice. He looked at Magnus; somehow their heights were even closer now, Alec's eyes only leveling about an inch under his boyfriends, even if he was in platforms.

Magnus rolled his eyes; "No they weren't. I'm fabulous and everything but it's a deadly fabulous, they'd have been too afraid of me going over there to kill them." Magnus gave an evil grin. Alec could almost admit he was probably right, even barely clothed, his boyfriend had an aura of 'don't fuck with me' which was probably the result of having years to perfect that exact message. There would always be something other-worldly about Magnus and that suited Alec just fine.

"I'm covered in sweater." He looked down, still not entirely convinced he could be the cause.

Leaning down, Magnus poked Alec's nose and smiled. "You haven't seen yourself remember? Just trust me, it was you. I should go beat them up anyways, maybe do a little magic . . ." Magnus looked back as though he were actually considering it. Alec quickly just linked his arm with Magnus's and continued walking until the Warlock stopped straining back.

When Alec finally released his boyfriend's arm it was to pull out his phone. He quickly began searching through his contacts until he found his sister. Opening a text window he began to type.

xxxxxx

"Izzy, you at the institute?"

"Ya. Why?" Was her response only seconds later.

xxxxxx

Magnus tried to look over Alec's shoulder at the text but couldn't quite see. "Who are you texting babe?"

"My sister, if I'm going to have to face her, I'd rather give a little warning than have to deal with her head on when we get there." He went to reply.

xxxxxx

"Magnus and I are almost there, I should warn you about something though. I'm not sure how to say this so I'm just going to. We're women."

She took a little longer to reply this time "I don't know if that's some sort of internalized homophobia or sexism, but I would generally disagree."

"No Iz, we're literally women. Magnus got in an argument with a warlock, and the warlock made us look like… well. Yeah."

"OMG no way." She responded, but a moment later a second text came. "As much as I'm going to love this, it IS reversible yes?"

"Yea."

"Okay, good. Then I'm not going to feel bad about how much I'll enjoy this. See you soon. . . sis."

xxxxxx

Alec groaned, it was going to be a long and annoying evening. He could already tell. Magnus, having read the last text, stifled a laugh and took his boyfriend's hand as they walked up to the doors of the institute.

Okay guys, I need feedback. As much as I've enjoyed writing this I'm not sure about it, if you're actually interested in it leave a comment so I can tell. I have chapter 2 ready to go but I'm going to hold out on you guys until st least a couple of you review.

Mo