Living dangerously...

The feeling if her hips pressing back entices you to go even further...

You begin to slide your finger in and out with more purpose, rubbing her clit with your thumb as you stroke your cock over her. Her hips are grinding against your hand at this point, and even though her eyes are still closed, you can see she's biting her bottom lip...

"For all she knows this is just a good dream..." You think to yourself, grateful she's such a deep sleeper...

"That's good to know..." You tell yourself, happy to have that information in case you decide to make another nightime stop...

You continue jerking your cock, fingers deep in your sisters snatch as she sleeps soundly, until you feel your cock twitching, eager for release... You take another look at her precious body before finally spraying your cum all over her exposed pussy... You don't bother to stop fingering her, instead pressing your cum inside of her with every push, giggling to yourself in your head at the thought of her waking up with your jizz dripping out of her little slit...

Feeling relieved and content with yourself, you put your dick away, but not before wiping it clean on her nightie...

"Fuck it..." You think to yourself, it's worth it...

You slip back into your room, happy with the way everything worked out...