A freaky step daughter # 4

It was around 2:30 when I returned home from a round of golf. I was tired and thirsty so I grabbed a Diet Pepsi and headed to the back yard to lay in the hammock. Just as I reached the back door I seen Sue and Mindy sun bathing on the deck. Sue had just a pair of thong bottoms on and her top laying beside the chair. Mindy had on a pair of bikini bottoms that were rolled down to just cover her pussy I could see that she had a full bush, her top was also laying by her chair. Mindy had a sweet pair of tits they stood up firm even as she lay on her back. Her areola was as big as a silver dollar and a dark pink colored. Her nipples looked to be big around but not real long but they were not fully hard either. I stood there and looked for a few minutes as I was trying to decide what to do. I then got a idea and went into the other room. I pulled my cell phone from my pocket and dialed my home phone as I knew Sue would have the cordless with her. It rang and I seen Sue set up and reach down and get the phone and answer it. I said Sue I am at the backdoor and see you 2 laying there can I come out with you??
Sue held the phone away from her mouth and said something to Mindy, Mindy swung her head around and looked at me then smiled. She turned and said something to Sue, Sue then held the phone back to her mouth and said yes come on out. I hung up my cell and headed out the door.
As I approached the girls neither moved to cover their tits from my view. I said you both have extremely nice tan lines and chuckled. They both giggled and thanked me. Just as I started to set down Mindy asked me if I would please put some sun block on her?? I said sure I would I am at your service. Ohhhh did you say “stud service” Mindy asked. I looked at her and said any kind of service you want plain and simple. I then shook the sun block and squeezed some out into my hand. It was cool to the touch so I rubbed my hand together to warm it then started to rub the block into Mindy’s legs and stomach.