My sister-in-law is one hot chick & as my brother isn't well, he's concerned about her sexual welfare. One day he drew me aside & basically suggested I take on the role of stud as she has always had a bit of a thing for me. I agreed, but it was up to her to make a move. Anyway, she'd been getting some sun, wearing just a skimpy black bikini bottom, working up a bit of a sweat & came inside for a drink. She popped upstairs for a shirt & that's when it got interesting! I was on the computer & she wanted some programming advice. The lesson didn't last long as she straddled me, opened her shirt & untied the bikini, telling me her cunt craved cock. She was kneading my groin with her cunt, the juices starting to make a bit of a mess, not to mention the heady smell of sex. I had a raging hard-on & wasn't sure I could stand the build-up. I stood her up & sat her on the table, opened her legs & thrust my yearning cock into her yearning pussy. God, I was in heaven as I pounded away. As she came, I shot my enormous load with force into her delectable crevice & we stayed clinched for a while longer. My brother would have heard the frenzy, so we were all happy. She confirmed that had I not been available she would have had to get it elsewhere.