Kim needs them

They didn't want to **** their sister into this but they wanted her more than ever now. So Jim and Tim decided to find out if Kim had even just once thought about fucking on of them too. They waited until after dinner, when their parents had both went to sleep and silently made their way up to Kim's bedroom. To their surprise Kim still seemed to be awake even though her lights were out. Both were startled trough a muffled moan, that came from their sisters direction. They could hear her breathing and at an slowly increasing pace the muffled moans that she couldn't hold back. Then another noise began mixing into this symphony of their sister, it sounded like something was vibrating in this room. The twins looked at each other trying to see if they both thought the same, was there sister really masturbating right before their eyes?

It took some time, but they began to see better, first only vague shadows but soon they could see their sister and everything else almost perfectly. Kim was positioned on her bed with her eyes closed, still giving the occasional moan. On of her hands holding a vibrator, going in small circular motions around her clit, the other hand of hers massaging one of her beautiful breast through the fabric of her bra. Jim couldn't believe what he was seeing it was to good to be true, he tried to be as silent as possible when he used on of his hands to take out his dick. While he started to stroke his dick, Kim lead the hand that was massaging her tit down her body, over her flat stomach to her pussy, that she had shaved only hours before. Her hand now taking the place of the vibrator, her other hand exchanged the vibrator for a big dildo. She brought the dildo to her mouth beginning to kiss the tip, taking more and more of it in, while messaging her sweet pussy. She let out another moan when the dildo left her mouth, this time not going back into it but rather taking it down and beginning to let it flow over her body down to where she needed it the most. She still had her eyes closed but began sitting up now, changing into a kneeling position, inserting the dildo into her letting out another moan, picking up her pace, a "please fuck me" escaping her lips. Going faster and faster till she couldn't hold back anymore, "please fill me up". She sank down onto the bed, breathing heavily.

Before Jim or Tim could think about their action or hold back they both came, their cum spurting onto Kim's bed. When Kim could open her eyes the Twins had scattered back to their room.