So my very best friend made a request a long time ago where she thought that Caroline/Katherine/Klaus/Stefan sex would be hot. I considered it, and tried a number of different scenarios out, and this is what I favoured. There's no sex, yet, but I'll get there...
Also, there's more and they're totally not in order but I'll try and explain where everything fits in as best I can...

'Does pot work for vampires?' Caroline asked as she knelt on the rug next to Katherine.

'Of course it does,' Katherine leaned heavily on the baby vampire and nuzzled her nose into Caroline's neck.

'Just like alcohol does,' Stefan explained as he passed the bottle of bourbon to her. Caroline took a swing and then wiped her lips. Stefan caught the front of her dress and she almost tumbled onto him as they kissed slow and lazy, but she pressed her hands to his chest and then rolled onto her back to gaze at the blue sky through the tops of the trees.

'Here,' Klaus had the joint between his lips and leaned close to her. He removed the roll up a moment before putting his lips to hers and blew the smoke into her mouth.

Caroline had only started, and they were apparently training her on how to smoke properly. Her decision to become a vampire had meant they spent the last weeks nursing her through her transition and then teaching her everything they knew. Caroline inhaled deep, and held her breath until her head spun, then she sighed. Klaus kissed her neck as she let the haze settle into her brain, and the busy started to slow down.

'Seriously, you three are high already,' she said with a giggle as Katherine crawled over Klaus' back and pushed his shirt up. Caroline helped her and soon Klaus was shirtless on top of her as he made out with her neck.

'I think she's a Banshee,' Katherine said as she snuggled herself onto Stefan's lap. Stefan rested his chin on top of her head and twirled her hair through his fingers.

'Why?' Caroline asked from her place on her back. 'Who?'

'Elena,' Stefan rolled his eyes.

'People are always, you know, dying around her and stuff,' Katherine complained.

'Well you did kill her best friend,' Klaus said as he turned to try and look up at Katherine. Caroline shoved him until he was lying on his side next to her and she reached up to play with the wooden beads around his neck.

'I wanted her for myself,' Katherine pouted as she took Klaus' place on top of Caroline.

'I'm not some sex doll for you three to amuse yourselves with,' Caroline said as Katherine slid her hand up under the white cotton dress Caroline wore to cup her ass.

'Besides, Banshees scream and wail to warn of a death,' Stefan said as he took a pull of the joint he'd rescued from Klaus.

'She's pretty good at screaming and wailing,' Klaus muttered darkly. 'But she's not a Banshee.'

'Why not, I want her to be,' Katherine sulked.

Klaus rolled onto his back and placed a foot flat on the rug. Katherine leaned across to rest her head on his chest. 'Please, King Klaus, make her a Banshee.' She kissed over his heart.

Klaus smiled, slow and dangerous, and Caroline's heart fluttered. He kissed Katherine slow and lazy, with a possessive hand around her throat. 'This is how you two should address me.' He said pointedly to Caroline and Stefan.

Stefan snorted and Caroline rolled her eyes.

'Oh please, behave, what king gets high?' Caroline tried to sit up but Katherine was holding her back. This time it was Stefan who gave her a shot of smoke with his mouth. Caroline cupped her hand around his neck and after she'd exhaled she pulled him into another kiss.

'I'll have you placed in my dungeon for your insolence,' Klaus warned.

Stefan smiled over at him. 'You tried that, and Caroline didn't seem to find it much of a punishment.'

Klaus grinned and Katherine moved back to sit on Caroline. 'Why haven't we started having sex yet?' She asked as she took a swing of bourbon. She pulled her top off and tossed it over Stefan's head with a cheeky giggle, then tugged her totally inappropriate for a walk through the forest high heels off and kicked them to the edge of the blanket. With teasing fingers she edged Caroline's dress up and tickled the tops of her thighs.

'You two start and we'll follow on,' Klaus said as he reached for the bottle. Katherine took the joint from Stefan and sucked in a lungful of smoke.

Katherine eyed Klaus and leaned forward, pushing her breasts into Caroline's. 'Here,' she placed the joint between Caroline's lips. 'Last hit baby girl. Just take it slow and easy, and hold it until you feel the burn.'

Caroline followed Katherine's instructions, and this time she didn't cough embarrassingly. Katherine kissed her cheek in praise and then sat up, pulling Caroline with her.

'Hi,' Caroline blushed.

'Hey,' Katherine smirked as she placed her lush lips on Caroline's jugular. Klaus and Stefan were helping to lift her dress up and then she was sitting in her white lace panties and bra as Katherine unbuttoned her jeans and lay back with her legs in the air to drag them up and off her feet.

Caroline couldn't help but giggle at her girlfriends antics, and Klaus was no better with his coordination as he rolled to his knees and wrapped his arms around Caroline's middle.

'I need new...partners,' Stefan said as he flopped onto his back next to Klaus and gazed at the three of them.

'You're the only one fully dressed,' Klaus pointed out and Caroline looked down at him as Katherine's feet landed in her lap.

'I'm shy,' Stefan said with a shrug but Katherine had already rolled over and was trying to tug his boots off. 'Are we seriously having sex in the middle of the woods?' Stefan asked as Katherine almost smacked herself in the face. She giggled and reached for his other one and he raised his eyebrows at Klaus.

'Why not, we've done it before,' Klaus said.

'Yeah, but not a few miles from civilization,' Stefan said. 'I can see the church ruins from here.'

'Banshee's wail, and the few I've met are rather ugly and harassed,' Klaus said as he nipped Caroline's shoulder.

'Are we still talking about Banshees?' Stefan asked as he relented and tugged his t-shirt over his head and then unbuckled his belt.

Klaus shrugged and let go of Caroline to remove his own pants. He tumbled onto his side and with a grin stole a kiss from Stefan. Stefan fisted his hand in Klaus' hair and dragged him closer to deepen the kiss.

'Maybe the boys are starting first,' Katherine smirked as she crawled back into Caroline's lap.

'What are Banshees like?' Caroline asked when Stefan let go of Klaus. 'And when did you see one?'

'We,' Klaus looked at Stefan and Stefan nodded smartly, 'we saw one in Ireland, surprise surprise.'

'What were you doing in Ireland?' Katherine paused her kissing of Caroline's tummy.

Caroline watched as both vampires shrugged and muttered things about spell ingredients and generally avoided eye contact with Katherine.

'What did you do?' Caroline asked.

Klaus looked up at her from under his lashes and Stefan took great interest in his daylight ring. 'We may have went looking for magic mushrooms.'

'Niklaus!' Stefan snapped.

'When?' Katherine repeated.

Stefan tightened his lips and then huffed out a breath. '1927.'

'I thought you two were kidnapped in Russia and held captive for months?' Katherine raised an eyebrow.

'Did we say that?' Stefan asked.

'I don't know, its a long time ago, I thought it was 1917 we were in Russia,' Klaus murmured.

'Pretty sure it was,' Stefan agreed.

Katherine glared and Caroline trailed her fingers over Katherine's arms and up to slip under the straps of her bra. 'Hey, ignore the nasty boys,' Caroline whispered soothingly as she nibbled Katherine's bottom lip. 'Come on sweetie.'

Katherine dragged her glare away from them and deepened the kiss, dominating Caroline's mouth. Caroline lay back on the blanket and slid her hands around Katherine's back to open the snap of her bra. 'You're so gorgeous.'

'So are you baby,' Katherine said in her huskiest voice.

'Okay, okay we'll make it up to you,' Klaus muttered. Caroline opened her eyes to see the Hybrid hovering behind Katherine and pulling her up so he could lick and suck her throat.

'I want to take Caroline shopping,' Katherine said.

'Okay,' Klaus said.

'To Milan,' Katherine said.

Klaus made a face. 'Don't bankrupt me.'

'Alone,' Katherine smiled at Caroline, and Caroline smiled back.

Stefan sighed and Klaus nodded. 'I suppose you two deserve some girl time.'

'I know what you two get up to when you're alone,' Katherine said wagging a finger between Klaus and Stefan.

'Yeah, no more trying to turn kittens into vampires,' Caroline said with a giggle. Stefan pointed at Klaus.

'Well it worked,' Klaus said.

'She almost set Damon's Persian rugs on fire,' Stefan pointed out.

Klaus scowled. 'I hate those rugs. And besides, we got her a daylight collar.'

'And when we get back, we better be treated like the queens we are,' Caroline said. Stefan kissed her long and slow and then turned to Klaus and nipped at his bottom lip until Klaus opened up to him.

'I want to move, I don't like it here,' Katherine said as she screwed her nose up.

'But we're practically naked,' Stefan looked around him at their clothes strewn all over the place already.

'Not here dumb ass,' Katherine said as she moved to let Klaus take her place between Caroline's knees. Stefan pulled Katherine onto his lap. 'I want to move away from Mystic Falls.'

'I said not until graduation,' Caroline reminded them. That had been one of her rules when she'd asked to be turned. There was a whole sheet of them and Caroline kept a copy folded in each of her favorite purses.

Klaus sighed and Stefan buried his face in Katerine's neck.

'Can't you graduate early, I'm sure you qualify,' Stefan said. Caroline knew that now that Klaus' curse had been broken there was nothing holding them here except for her. It made her feel good inside, knowing they were willing to stick around just for her.

'I want to graduate,' Caroline pouted and Klaus turned to glare at them.

'If Caroline wants to graduate, then let her graduate,' he said. 'We all have to respect each others dreams and desires and wishes.'

'Okay, someone's sobering up. More pot and bourbon please,' Katherine said as she stretched out towards her bag.

Klaus relaxed on top of Caroline and they made out while Stefan expertly rolled a joint and Katherine opened the second bottle of bourbon.

Caroline turned her head to the side to watch them.

'And Banshees tell of death to come, not death that's here,' Klaus muttered as he rested his head on her breasts.

Caroline sighed. It was going to be a long afternoon, and she never wanted it to end.