So I have an update to my situation with my sister in-law since writing a post a few days ago. My wife and I felt bad for my sister in-law this year, as she was spending the holidays alone. So we went ahead and invited her up to spend New Years eve through this coming Sunday with us. I'm not going to lie I was/am a little nervous based on how I left things with her this past summer... (see my first post if you need brought up to speed).

When my sister in-law arrived my wife invited her in for lunch first thing, since she had a pretty long drive. We had a nice low key conversation, catching up on the going on's in each others lives. The whole lunch I was dying inside anxious that my sister in-law was going to bring up the pantie incident from the summer, luckily she didn't.

Lunch wrapped up and my sister in-law asked if I could help her bring some of her things in along with some gifts. My stomach dropped, this was the first time being alone with her since borrowing her panties over the summer... As we walked out to her car we made light talk then seemingly out of the blue she asked "So... what did you do with my panties last summer and why did you leave them for me to find? I'm pretty sure I know, but I want to hear it from you". I froze I was speechless and turned beet red. I told her I had no idea what she was talking about...but my body language gave me away, she knew I was guilty as charged. Afterwards we made some awkward exchanges but nothing of substance. Those 5 minutes felt like the longest 5 minutes of my life.

Fast forward to the evening, some friends arrived for the NYE party we were hosting. Everyone had a good time, there was PLEANTY of alcohol to go around. I couldn't take my eyes off my sister in-law, she definitely wore her special 'little black dress' that accentuated all the right parts of her. It felt like anytime she had an 'innocent' opportunity to grind her flawless ass into me, she took it, knowing full well that I had to hide the subsequent bulge in my pants.

Shortly after the ball drop the guests left and my wife announced that she was going to bed, she's not much of a night person to begin with. I volunteered to stay up and clean up a bit and my sister in-law was all too eager to volunteer to help. At that point I was so drunk, I lost my filter and I responded to every flirt and advance she made.

We eventually ended up on the couch where she hiked up her dress just enough to reveal her sexy light blue panties with mesh front and embroidered with a little flower motif. She straddled me and lowed herself on to the massive bulge in my pants. As she slowly ground her soaking panties/pussy on bulge I moaned, she leaned forward and whispered in my ear "I want you to confess what you were doing with my dirty panties this summer. I want to hear what you were fantasizing of doing to me as you sniffed my panties."

My head was spinning in pleasure, I confessed EVERYTHING as she ground herself on me, soaking not just her panties, but now my pants as well. After a few minutes I came and shortly after I felt her tight little body convulse as she orgasmed. We were a mess, my pants/underwear were thoroughly soaked and sticky and she was a hot sweaty mess herself. I must confess it is a bit embarrassing to have cum from dry humping, which I haven't done since high school, but my god it was indescribably hot!

The next day she came out of her room as if nothing had happened. We opened the gifts she had brought which were nice, but nothing special. A little later while my wife was in the restroom my sister in-law whispered in my ear "I left you a special present in my laundry basket...". When I had a chance to excuse myself, I bolted straight to her laundry hamper. What was on top...? It was those sexy light blue panties she wore when she grinded herself on me, with all the creamy juices from that night. I couldn't help but give them a good sniff. I was immediately back to the night before... I got so hard.

She's going to be staying with us for another few days so, I am equally anxious with anticipation and terror that my wife will find out. But, we'll see what the next move is going to be.