It started when my sister-in-law asked me to feed her cats when she went away for a few days. I was wondering if she had a dildo, so went through her drawers and found nothing. But just then I saw a pair of panties on the floor.
I picked them up and put them to my nose to take a sniff (yummmmm). It was better than any smell I have ever smelled. Just then my cock got hard so I took the panties and wrapped them around my cock and started stroking. Thinking of her masterbating I felt like I was ready to cum so I blew my load in her panties, it was one of my biggest loads ever. I put them back on the floor. It's weird my sister-in-law looks at me funny everytime I see her now, but nothing has been ever said. I hope she says something. I will do it again if she wants.