My Fantasies About My Sister-In-Law

I've been wanting to share this set of stories for a while now. There are more "episodes" to the stories I've shared here and if people like them, then I'm happy to share.

I'm a 46-year-old guy who lives in Australia. I'm about 5ft 11in, built like a rugby player (because I am a rugby player in my spare time) and am originally from London in the UK. I moved over to Australia about 5 years ago with my partner at the time who is Australian. I got to know her family well over the years and even though my partner and I are now separated, I'm still considered part of the family and get invited to family events, etc.

The focus of this series is my infatuation with my sister-in-law, Samantha. She's about 4 years old than me and we've always had a good relationship both when I was with her younger sister and after we separated. I actually used to live with Samantha years ago as flatmates and ever since meeting her I've had the biggest crush on her.

She's about 5 ft 5 in tall, well-toned, with stunning 36C breasts and the sexiest ass I have ever seen. She's very stylish and while she has ended up marrying a very rich man, she was quite the party girl in her 20s. From what I've heard from her sister, that "party girl" approach to life definitely crossed over into slut at times.

Over the years of knowing each other I've jerked off too many times to count while thinking about her or looking at pictures of her and when I was having sex with her sister, I would definitely be thinking of Sam.

This masturbation fantasy took a turn recently and has only gotten crazier as time has gone by. This first story is about how things escalated.

The story begins with a confession. My habit of thinking about my sister-in-law while I stroke my cock turned into me actually stealing her panties and jerking off into them over the past few months. I'm round her place a few times a month for one reason and another and one day I was in her laundry room where I found newly cleaned laundry waiting to be put away. Out of the corner of my eye I saw the shine of silk and my heart rate raced as I realised they were a pair of her lingerie. Before even thinking about what I was doing, I had quickly grabbed them, shoved them in my pocket and then made my excuses and left her house. As soon as I got home I whipped them out of my pocket and admired them. Within seconds, my jeans were around my ankles and those panties were wrapped around my cock as I stroked myself to a huge orgasm. I came so hard and absolutely soaked the delicate silk with cum. She is so insanely hot and stroking my cock while it's wrapped in her panties drives me crazy.

This continued for a few weeks and I've always either kept the panties I've used, or thrown them away or washed them and returned them. But now I think I might have gone a step too far.

About two months ago several of us were over at her place for a family lunch. When I arrived she was in the kitchen and was looking so sexy. She was wearing this great outfit - tight jeans that hugged her gorgeous full ass and this crisp white shirt with the buttons only done up part of the way so her breasts were easy to see and enjoy. She wasn't wearing high heels, which would have sent me over the edge there and then, but she was looking stunning.

We all got to chatting and I couldn't stop looking deep into her eyes and checking out her body at every possible moment. She's quite a touchy-feely kinda person and so every time she walked past, she would touch my arm and my cock would twitch.

It wasn't long until I excused myself from the dining table and headed to the bathroom upstairs. On the way, I quickly dashed into her bedroom, opened up her lingerie drawer and found a new pair of panties I hadn't seen before. They were a bright neon pink pair in a lovely silky material. I whipped them into my pocket and went off to the bathroom where I quickly got my cock out, wrapped the panties around them and started stroking. I'd been saving myself for a few days for this moment and so it didn't take long until I came and came hard. My cum went all over the panties and flooded through the material, so they were soaked.

Now this is where I did something I have never done before. Instead of hiding them away in my pocket, I went back into my sister-in-law's bedroom and put the panties back in her drawer. I cannot explain my thinking and have no idea why I did this but it happened.

I headed back downstairs; we all finished up lunch and then I headed off. As I drove away, the potential repercussions of what I had done started to hit me and what had been a foggy-minded, driven action came into sharp focus as a very dangerous and foolish thing to do.

I didn't end up seeing her again for about three weeks for one reason and another. But then we had a family get-together, and so I was back round at her place. She was looking good in a sundress that showed off her legs and would tease me as it blew in the breeze, almost giving me a glimpse of her ass.

When I arrived, I gave her a hug and kiss on the cheek as usual and she smiled and squeezed me and said, "It's been too long." The party started and after about an hour I decided it was time to have some fun so I took myself off quietly, went up to her dressing room to find myself a fresh pair of lingerie to play with. Before I went into the room, I checked to make sure no one was nearby and then ducked inside the room. I pulled open the drawer and started to reach in to find a pair of panties to wrap around my cock when I stopped and noticed a small piece of paper. I picked it up and as I read it I felt like I was going to faint. Written on the paper was "Use the white ones - they are new and feel so good on."

My heart raced and I felt dizzy. I didn't know what to do but I had to get out of there. I grabbed the white pair and dashed to the bathroom and locked the door.

I stood there not sure what to do. I re-read the note a couple of times and then I began to calm a little. As scared as I was, I was insanely turned on and as my fear calmed, my horniness took over. I got my cock out, wrapped these white silky panties around it and jerked off. I didn't last long and came so hard all over them.

Now I had a decision to make - what do I do next? I decided to put them back in the drawer and take the note.

I went back downstairs and I swear my sister-in-law turned and smiled at me as I walked back into the kitchen. I kept away from her for the rest of the party but when I went to say goodbye we were making small talk and she quietly said "Hope you liked the gift. See you soon," and kissed me on the cheek and she went back to the party.

I want this to go further and would love her to watch me jerk off in front of her but that seems crazy right now.

I'll share more soon if you want to hear what happened next.