Go to Lizzy's room to wish her happy birthday
From Create Your Own Story
Remembering its your siblings birthday, you go to wish the 18 year old first.
Before knocking on her door you hesitate as you can hear something come from her room. A soft moan. Immediately your cock which was already hard, begins to twitch. Curiosity drives you to 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. You take off your shorts and begin to rub your own hard cock. 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
