Boring Rainy Weekend

Rain, rain and still more rain stuck at home with my sister, nobody else. My seen me rubbing my cock thru my pants asked was I horny, I replied always. Well so am I she responded, how about we help each other. Slightly shocked but what the hell so we fucked, took precautions. That was late last year, we've started a mutual sexual benefit type arrangement. If she is horny, she winks at me and we fuck, my winking at her sometimes gets me a fuck not always. It's not hurting anybody and is a personal extension of our family bond.