My sister in law

It is a Saturday-morning. I have taken a long shower and decided also to shave my balls again. I still have an erection of shaving when I walk out of the bathroom while drying my face with a towel. Turning left to the bedroom I hear a startled ‘Oh, excuse me’, from the stairs which is located in front of the bathroom door. ‘I was not aware that you were in this bathroom. We thought that you used the bathroom upstairs. I just wanted to take a shower’. ‘OK, yes, good morning, excuse me’, do I say startled as well. I knew my sister in law was planning to stay the weekend with us, but I did not expect her to be arrived already. I walk to the bedroom, but turn around without thinking about holding a towel in front of me, say that I’m finished and the bathroom is free. My sister in law smiles a little bit and cannot prevent looking down to my penis. Because of my feelings about her, I have a full erection right now. Like there is not any shame. Like it’s saying, ‘Here I am, baby. All yours’. We look each other into the eyes and both smile with hesitation. I go to the bedroom, while she enters the bathroom.

I’m so excited that I cannot resist myself from jerking off. A little bit strange. My wife downstairs in the living room, my sister in law in the bathroom next to my bedroom. I always tell my wife that I do not jerk off, but in fact I do know, she does not believe me. Sometimes I am wondering if she knows about my collection close-up pussy pics? Does she smell, when I have jerked off while she was not at home? I also start to wonder if she suspects my horny feelings about her sister? We have a good and happy relationship, but I cannot resist myself jerking off now and then while having a fantasy about my sister in law. Last time was already a few weeks ago. She stayed the weekend at our house as well and took a shower. She left her towel to dry in the bathroom. While both sisters went shopping, I took a sniff of the wet towel hoping for to smell my sister in law. I took the towel, rolled it around my dick with the most wet spots touching my dick and jerked off.

At night the three of us have a nice dinner with a good wine. Maybe due to the wine, maybe due to what happened in the morning, my sister in law is flirting with me. We always have had a good relation, but after this morning there has changed something. I do look at her, but I’m a little bit hesitating because of my wife Linda sitting next to me. In fact she has her hand on my lap even at the height of my crotch. I have pay attention not getting an erection. What would be the cause of the erection?