Fun on the Farm

I'm Clark 22 and mechanic by trade and moved onto my grandma's farm in late 2020 when grandpa passed away, heart attack. Muriel 59 had to run their small chicken farm 234 acres by herself, her daughter Kathleen 38 divorced(my mother) worked in city as a nurse and couldn't come home to help. Both me and Kathleen are the only child of our parents. I could help and didn't affect me much at all. I worked Monday to Fridays 730am to 430pm and so I get up at 5am and feed the chickens and have breakfast with Muriel and go to work and similar thing on getting home. Fix what's needed on the weekends and then work on my grandpa's old pickup I'm restoring. As things usually happen I was caught in the shed masturbating myself and Muriel decided to have some fun herself. That's how I started fucking my grandma. Then 3 months ago Kathleen got a job nearby and moved back with Muriel and me. I was shocked to find out that she already knew I was fucking Muriel, they didn't have any secrets from each other like they always had told me growing up. To my surprise she also wanted me to fuck her and I done as requested and that's how it's now.