It started at Christmas

I'm 24 now; last Christmas I was 23 at a family get-together. I had no girlfriend and attended alone. My aunt, I'll called Ronnie, 48, was there with Uncle Fred not his actual name, but it will do. Fred liked to drink and play Golf, so he wasn't paying much, if any, attention to Ronnie. Ronnie was horny, and I was the only unattached male present. Ronnie wanted to see the sights, as she put it, so I drove her around to see them. We ended up at the old lookout; nobody else was around. Ronnie made her needs clear to me; I was aroused also and agreed to fuck her. That started us fucking every chance we got. In the new year, I got a job close to where Fred and Ronnie lived. I had no plans to continue our Christmas fling. Ronnie saw it as the best way to satisfy her sexual needs. I worked mostly nights, and Fred worked days only. So, Ronnie would visit me after Fred went to work and drain my balls. Because she wasn't spending any extra money, Fred was ignorant of her visits to me. She cycled to visit me each day, exercising as far as anyone could see. Followed by more horizontal exercise at my place, before cycling home again. Even on the weekends, when Fred would play Golf.