My nieces panties

About a month ago, my niece ran naked across the hallway not noticing I was just coming down the hall. She’d just had a shower and decided to run quickly to her room hoping that nobody would see. She was soaking wet from the shower and even though she was my niece, I thought she was fucking hot. Her little chubby tits bouncing and her white booty stood out like nightlights!
Later, I decided to have a shower myself and as I walked into the bathroom I saw her panties lying on top of the laundry basket. Straight away, the thoughts of Em (my niece) naked came back to mind and then I started to wonder what she’d look like in these. I picked them up and they felt wonderful, my cock was rock hard from thinking about her and without another thought I started stroking myself with the panties. They felt so good wrapped around my cock that I just had to put them on.
I left the bathroom door open as I stroked, watching myself in the mirror. Maybe she would walk down the hall and catch me. Thinking about this possibility made me sling streams of cum all over my bathroom counter, mirror, and soaking her panties. I put them back all squishy with my cum. She hasn't said anything about them yet...