Ben/Gwen gets the Omnitrix thing

>Ben wakes up in timeline where Gwen ends up with the watch
>Doesn't get fixed and leaving him real pissed, which he tries to take out on Gwen
>His increasingly bratty behavior starts to get on Gwen's nerves though
>Unfortunately for him, she KNOWS how envious he is that she got the watch
>Leading her to retaliate by messing with him in alien forms
>At first just minor things, but Ben's ego won't let him back down and soon things spiral out of control
>Sadly for Ben, without the watch Gwen ends up winning far more than she loses in their little prank war
>To make matters worse, the burning shame starts getting mixed with a strange, funny feeling each time Gwen humiliates him
>At first it was while she was just in alien form, but now it's happening even when she one ups him in human form and he's not sure what it means, but he kinda likes it
part 1 1/2

>Things comes to a head one afternoon when he provokes Gwen into manhandling him in her four arms form
>The boy ends up with a face full of red alien tiddies while she's pinning him under her and he ends up poping a boner much to his embarrassment
>One that Gwen notices, which ends with the two of them just awkwardly staring at each other for a moment before she gets off of him and leaves
>At first he does his best to forget about it, and it seems Gwen does too
>Until a few days later when while in heatblast form she strikes a pose and makes a joke about being hot
>All while staring at Ben out of the corner of her eye to see his reaction and to the boy's horror smirking when she sees him blush
>Gwen starts gleefully teasing Ben every chance she gets from then on
>"Wresting"/pinning him in four arms or Diamondhead form, sneaking up on him during his "alone time" in upgrade or ghostfreak form, and just plain giving him more glimpses of alien curves than a boy his age can handle
>Made all the worse for him by the realization that he actually DOES think she's hot, but if he ever admitted that then she'd win
>Things only get worse when she discovers she can use magic too, and there's a number of spells with rather lewd applications for a clever witch
2/2
part 1 2/2

>It didn't start that way though
>At first Gwen used only minor hexes and spells against him, such as things to make Ben be quiet or leave him itching the whole day
>He saw it as yet another way for his already overpowered cousin to fire back against his verbal barbs
>Too late he realized, she was just flexing her mystical muscles, testing things out to get a feel for how far she can push a spell
>Or how subtly she can cast one
>Ben never did figure out exactly when she started moving on to the next phase of her plan
>Even before Gwen discovered she could cast spells his dreams were starting to go in ...odd directions when involving her
>Often involving her atop him in some alien form or another, not unlike that incident with her in the four arms form that started this so long ago
>But seemingly without warning they started getting far more frequent and far more intense
>Turning from vague fantasies to nightly displays of temping figures, teasing displayed, and promises of more if he'd kneel down and submit to her, and alien or human, it's ALWAYS Gwen
>It's enough to leave him hot and bothered in the morning, if not with an embarrassing mess he has to deal with once he awakes
>He only starts to piece together whats going on two weeks into it when something jogs his memory and he remembers waking up just long enough to see Gwen standing over him, purple glow around her hand as she makes a motion and with a "Go back to bed Ben"  sends him back to sleep
part 2 1/3

>By the time he confronts her though, she's already worn down his mental defenses enough that she's no longer limited to just fucking with his sleeping mind
>A few sweet, whispered words in his ear, said in a language he can't place, forces his anger to evaporate, and his mind to fall into a haze for but a moment
>A light touch, one buzzing with magic, brushing across his arm and his heart is sent fluttering as he's left light headed
>It must be witchcraft Ben tells himself, it has to be as he finds himself falling into a daze
>He wakes up on the couch to find Gwen smirking down at him
>"Pleasant nap Ben? Go get my laptop"
>He makes it half way before he realizes he's obeying
>Worse he's not sure if he doesn't want to
>A glare sent back at Gwen quickly turns to a blush
>As a slight sway of her hips catches his eyes and leaves his face heating up
>He's not usually THAT obvious the boy tells himself as he hands her her computer
>"Notice anything strange?" she asks, a peculiar note of nervousness in her voice
>Wanting to get away as fast as possible and hit with the sudden urge to ...relieve some stress, Ben simply shakes his head
>"Good" she answers, her composure regained as he rushes out of the room
>It isn't until right before he goes to bed that night does he realize WHY he had such a strong response
>Her shirt was on the floor next to her, Gwen was completely topless!
>And for some reason... he didn't notice it at the time
>...For that matter, he can't remember a thing about how she looked save her face
>Telling himself it just has to be that she's really getting to him he forces himself to go to sleep
>Not before rubbing a few out to the thought though

>Turns out she was half naked
>She has some sort of spell, or illusion, or something that leaves him unable to notice things
>And now she's started gleefully abusing it whenever they're alone
>Leaving him only able to subconsciously tell if she's strutting around, flaunting her body for him
>And at the same time tormenting him as she keeps him from seeing ANYTHING even while he's staring right at her
>He's pretty sure she's started using it to spy on him when the frustration becomes too much as well, judging by the little hints she occasionally drops about him jacking off too much
>One of them does manage to provoke him to firing back with a "I wouldn't if you at least put on some underwear Gwen!"
>She just gives him a smug smirk, "I got a shape shifting spell I want to try, you volunteering?", instantly shutting Ben up and leaving him unable to think clearly for the rest of the day
[spoiler]>It's three days before he works up the courage to ask if she was serious about that
>The fourth he spent wrapped around her hips
[spoiler]>The fifth burning with anger and embarrassment that the illusion spell wouldn't let him remember what her body feels like either[/spoiler][/spoiler]

Not all of what I wanted to include, and started petering out towards the end, so called it quits while I could, hope you like it /co/, might try some of the alien ideas later, won't be nearly as long though, each will probably be it's own minor snippet