[39 M] Obsessed and can’t stop stroking to my wife’s younger sister.

My wife’s younger sister is 33 and I am obsessed about her. I think I have been fantasising and jerking off to her for almost 5-6 years now.

Ever time she posts a pic on FB/ Insta or even on the family WhatsApp group, I just have to stroke to it! I imagine her in every porn scene that I have watched and have tons of fantasies for her. I have also stolen a couple of her panties and love to use them to jack off.

Makes me feel guilty as hell but just can’t stop myself!