I spent the night wondering if my mom knew about me, because I knew about her. So, I had another night of not a lot of sleep, but I still had to get up and go.
Later, when I got home, I saw mom's car in drive and thought it odd she was home this early. I went into the house and didn't see her, 'Damn, is she next door?' I went up to my favorite place and peaked into the bedroom and didn't see anyone there.
I turned to leave and then I noticed them in the backyard. They were both naked and he was fucking her doggy style. It was a side view for me and I could see as he would pull away and then slam back in. She seemed to like it a lot, but he moved to hold her hip with one arm, as he kept doing this. He was guiding his cock back in with his other hand.
Then he did it again, but this time she jumped and acted like she was trying to get away. But she couldn't because he was still holding her. He was also saying something and it looked like he was still pushing. Then I released what he was doing. "He's trying to fuck her in the ass," I screamed.
She seemed to struggle a bit as he kept pushing, then she stopped and I think he had his cock buried in her. He then went back to fucking her in the ass and now she was letting him. I also noticed that she was fucking him back, grinding into his cock. He was fucking her hard and filled her ass. When he pulled out and spank her ass as he laughed, she would laugh back at him. He pulled her up and glanced my way, as he led her off to their outdoor shower. I jumped back, hoping he didn't notice me.
A little bit later Mom walked into the house wearing her bikini. I met her and asked, "Where have you been, Mom?"
"Oh, I got out of work early, so I decided to use their pool to cool off and work on my tan."
"Okay."
The next day, I heard a knock on the door and I opened it and there stood Becky, "Are you guys still coming to the party?"
"Yes, I do believe so."
"Great, it's a pool party and kinda has a theme to it."
"Okay, and that is?"
"Well, it's a pool party and all the girls are wearing the same suit and the men are wearing the same.... so, everybody is the same!" Then she handed me a bag, "Here is yours and your mom's," and she turned to walk away. I shut the door and headed back in.
Mom asked me, "Who was at the door?" I told her who and why. I opened the bag and pulled out the tiniest, pink bikini I've seen.
I looked at Mom, "We are supposed to wear these."