Last night I was hanging out watching some shows with my sexy ass sister-in-law. She was feeling sleepy towards the early hours of the morning so she started drifting off. I looked at how tempting her DSLs were, wanting to just start rubbing my cock against her lips. As I rubbed my cock through my pants I realized that she was asleep and her bedroom was right there. So I quietly got up and went into her room. It took me just a moment to find her dirty clothes hamper once I flipped the light on. I dug around looking for my prize and was rewarded with a nice plain black pair of panties. I turned off the light in case she woke up randomly, I'd just claim I was looking for whatever movie or book if she did wake. I located the crotch of her panties, that place where her other pair of sexy lips spent hours pressed against. I leaned over to peer out her doorway at her sleeping on her couch and pressed the panties to my nose. It only took a moment and I was compelled to pull my cock out so I could start jerking off. I breathed in deeply a couple times and then I licked them, once, twice and then I just stuffed it into my mouth. Lapping and sucking the heavenly flavor up as I jerked off as fast and quitely as I could manage. It didn't take very long I have to admit. I've known her since she was 15 and my wife 17 (Same women from the Aug 1st 'My sister-in-law' confession). Having been about 10 years I've got more than a few thoughts about this sexy little thing. I moaned into the panties as I sucked out every bit of dried juices, thankfully the panties muffled it. My knees felt weak and I got a touch light headed. I barely resisted the urge to cum all over the crotch of her panties. I carefully as I could put them back into her hamper about where I thought they'd been. Slipped into her bathroom and cleaned up. I sat back down and pretended to still be watching the show. It wrapped up and she woke up randomly, I was pretty sure she'd been asleep but now I worry just a little. Was she pretending, is she going to tell her sister? My wife would probzbly just roll her eyes and tell me not to do it again without asking. Just thinking about it and writing it up as it happened, I couldn't help but get a used pair of my wife's panties and cum on them. I'm ashamed I violated my sister-in-laws trust by well, basically molesting her panties, but well not enough to not be excited by it. Maybe even more excited because of it. I wouldn't turn down a chance to taste the source directly but my main focus will still be trying to find chances for my wife to seduce and fuck her sister.