I was 27 when the following took place. My mom-in-law (Penny) was around 48.
Every second or third weekend my wife and I would travel the 80 or so kilometers to her folk's small farm. They were not really farmers, just liked the space and the quiet. They had also built a small cottage on their property for my wife's grandmother who was fairly mobile but needed a bit of help occasionally. It was my wife's habit to drag me down to gran's cottage every Saturday we were visiting to see the old dear. I would stay a while then leave them to chat for an hour or two.
I preferred being around Penny anyway. She has brown, curly hair, really good legs and big tits. She had even discussed getting them reduced with my wife and I, not sexually but quite seriously. I managed to convince her otherwise saying I thought it was not good to fiddle around unless there was a real problem. I loved seeing them swing free as she seldom wore a bra when at home.
What I really liked was when she decided to take a dip in the pool. She is totally not fashion conscious and wears a one-piece but does not shave either her armpits or pussy. In her bathing suit all the hairy bits come to life. Usually after swimming she'll put on a T-shirt after rolling down the top of her suit. She goes for those baggy ones and I always position myself to see through the drooping armholes and catch glimpses of her dark brown nipples.
She is a bit of a dominant person although really kind and very friendly to me. She quickly caught on that I was quite prepared to do almost anything she requested and often had me helping out. Tim, her husband and my father-in-law, is always off traipsing around the farm fixing pumps and stuff.
One Saturday after swimming and BBQ-ing I was dragged off for the usual visit and after about 30 minutes ducked off. Penny had been wearing a specially droopy shirt and I wanted to get back to perving at her tits. I helped her finish clearing up, Tim was gone as usual, and then announced I was going to take a shower.