Your sister

You heard her first.

"Eww, what's that smell? Gross, what's been going on in..." she fell silent as she turned into the lounge and spotted you. There in the doorway, staring at you in shock was your sister. You stared back in stunned silence as your mind raced - how could you explain this? In the end, your mouth moved before your mind caught up.

"I - I'm your brother's... friend." You stammered, your high pitched, girly voice a huge distraction as you struggled to explain the situation. "I woke up and... and he wasn't here so I tried to leave but his fr... those guys wouldn't let me and..."

You trailed off, unable to put into words what just happened to you, but evidently you had said enough.

"Oh you poor thing!" Your sister gushed with genuine concern as she rushed to your side. "My stupid brother is bad enough, but those assholes! Look what they've done to you!"

You had never known your sister to be the caring type, so it was a surprise when she started to wrap you up in one of the cum-stained sheets and help you to your feet.

"You know where the bathroom is, right?" She asked. "You should go clean yourself up, you'll feel better. Then we can think of a way to get those bastards for what they've done. You wouldn't believe the number of times they've tried it on with me. Hell, two of them even snuck into my room one night and tried to..." she winced. "My dipshit brother didn't even have a clue!"

That had been a revelation - some friends. You had little time to think on it though as your sister pushed you towards the bathroom, insistent that you get cleaned up.

The shower did indeed help, some of the shame seemed to wash away with the thick layers of cum as you soaped yourself off. You even washed your luxurious, long hair and when you stepped out of the shower you felt surprisingly good. A pang of humiliation hit you when you realised that was probably in no small part due to the multiple orgasms you just had, but you quickly pushed the thought away.

As you dried off you spotted a pile of clothes left for you - your sister's, obviously. They were clearly not her best, but they seemed nice enough if a little, revealing. As you slipped into her panties you realised that now you were a very similar size and shape to your sister, perhaps just a little thicker judging by the fit. The bra too, was a little tight. Did you have bigger tits than your sister now? You shook the thought away as you finished dressing and tried to focus on the important question - what the fuck were you going to do now?

When you stepped out of the bathroom that question was answered for you, at least for the moment as your sister called you to her room. She looked you over taking in your figure in the simple skirt and crop-top tee she lent you, giving you a quick nod of approval before jumping into action.

"Right, get over here and let me..." without waiting she attacked you with her make-up kit, applying a little lip gloss, a touch of eye liner and some powdery stuff with a brush before taking a step back. "Aaaand, perfect! You're very pretty you know. Now look, I know some guys who can help you and it just so happens I'm about to go see them... and your coming!"

She kicked a pair of pink flip flops at you, then grabbed you by the arm and dragged you out into a waiting Uber.

"These guys are soooo cool! They're gonna love you! Oh, and help you too of course, but today is going to be so much fun!" she gushed, noticing your concerned expression as you watched her closely. She was wearing that smile, that almost predatory smirk that only ever meant one thing. She was up to no good.

"I'm Sam by the way." she added in a sugar-sweet tone that only heightened your concerns. Samantha tilted her head expectantly as she waited for your response and you realised you were going to have to come up with a name fast, all the while worrying about where your crazy bitch of a sister about to take you.