Fucking my stepsister on her parents' ranch.

My half sister and I were bored at the ranch that her parents bought, and we had a lot of accumulated lust, as we hadn't been able to have sex for 2 days. Her parents have a habit of going for a walk right after lunch, for about 30 minutes at the most. With that in mind, we were ready to enjoy the moment, we intention to not be hungry and when they went for a walk I took advantage and fucked her hard to cum as quickly as possible, she came in 5 minutes and I came in 10.