Immediately chase and find out who it is
From Create Your Own Story
In a split second you take a single lunge and throw open your door to find a figure trying to tiptoe and run towards there room
you realise it's your naked sister's, Lizzy, ass and her brunette hair as she disappears into her room. She hasn't realised you've seen her. You quietly make your way to her door and listen, you hear her lie down on her bed, and after a moment soft moans come from her room. You push the door slightly ajar to see her tight athletic body lying flat on her back, with her eyes shut, one hand caressing her small tits and the other slowly rubbing her tight clit. Her moans were now louder and you could make out words,
"mhmhm....right there....don't stop.....yes....your sister.....Alex" she was thinking about you.
Instinctively, you begin to rub your own hard cock as your still naked. Your sister had always been a bit of a nerd, and you were almost certain she was a virgin, which was surprising, since you were almost certain she had daddy issues, as he was always working, and from your experience those girls started young. You had thought about her occasionally while jerking off, but only on the days were she'd accidentally flash you, or you'd walk in on her in the shower, but that was while you were a teenager, and she was your sister, you'd never act on it.
But now, seeing her skinny body arch, her fingers caressing herself and hearing the soft moans, slowly getting louder, your cock twitched in desperation, all sense of morals had gone as you began grip your cock tighter and jerk faster.
slowly creep into her room so she can't hear you
kick the door open so she knows its you
go back to your room, and text her telling her to come to your room its an emergency
