Sister-in-law's passionate kissing and intercourse lasting 4 hours (ERDM-135)

I'm temporarily staying at my brother and sister-in-law's house... and since my brother isn't home, it's just me and my sister-in-law alone!! This is a once-in-a-lifetime opportunity, and I want to take advantage of it to have a relationship with my brother's wife, whom I've long admired for so long!! We kissed passionately and had a secret night of sex with my sister-in-law!! As the temptations became increasingly intense, my yearning wife gradually succumbed!!