The answer is yes all the way

The more Liz rubbed my cock against her pussy the more she became excited. I told her to stop since I didn't want to cum too soon so I went back to finger fucking her. "All right Mrs. S. or Liz, are you like your daughter? Do you like what I'm doing or are you just a cock tease?"

Liz squirmed in my arm my finger still working her pussy. "John my daughter is watching!" Liz gasped.

"Come on Liz you watched me fuck your daughter plus you are already naked which tells me that you were not just putting yourself on display," I said. "Come on Mrs. S. rub my cock against your pussy some more and then guide me into you, after all, it's what we've been building up to since the night of the party."

Moments later much to my surprise Grace moved next to us. "Go on mom do it, you want John's cock just as much as I do. I bet you wet yourself watching while John had his way with me and you wanted to have a taste of what it is like for yourself."

"If you didn't want my advances you wouldn't have let me put my hand down the back of your bathing suit and you would not be in the pool naked now would you?" I said pulling Liz closer. "Come on Liz I can feel my cock rubbing against your pussy and I want in. What do you really want?"

I pushed myself against Liz and I felt my cock slide through her hand and into her pussy. "It's a perfect fit Liz," I said as I started sliding my cock in and out of her. "You know that you are making a dream of mine come true." I continued. "I used to daydream about having sex with you and now it has come true and I want more."

The only noise to be heard was the sloshing of the water between our naked bodies as I pumped my cock in and out of Liz's pussy. I felt her fingers digging into my shoulders as I continued fucking her and I could feel the ragged harsh breathing on my neck. "Go on make noise if you want to Liz, after all, I want to know that my girl's mom is enjoying herself," I asked her if she wanted me to fuck her harder. I had, of course, no intention of stopping.

"All right John, all right I wanted to feel your cock inside of me, I haven't had sex since my husband left and when you claimed Grace for yourself I wanted to be a part of it. I didn't want to be left out."

"Do you want John to cum inside of you mom? Do you want to feel his warm cum filling you up the way he fills my pussy? Do you want me to tell you how I feel when he comes inside of me? One thing it does to me is make me cum for at least the second or third-time mom."

Liz let out a long and loud moan as she started to cum and within moments I too began to cum. Liz held onto me as I pumped myself empty. Our lips met and she gave me a very passionate kiss. Both of our faces were flush with the passion that had just washed over us leaving us both a little weak at the knees.

Liz moved against the side of the pool and leaned on the coping. "It seems like forever since I had great sex." She said smiling weakly and blushing a bright red. "I'm sorry for giving myself to John honey, I guess the wine, sun and the boat race went to my head."

Grace smiled at her mother. "Do you remember what you told me, mom? You know about sex and who you have it with? You kept asking me if I pleased John the way a woman should please her man remember?" Liz nodded her head. "Well, did you please John?" She saw the look in her mother's eyes. "Don't give me that look mom you were prepping yourself for this moment which at least in my book makes you his woman doesn't it?"

"I didn't really expect..." Liz started to protest.

"Oh please mom, wasn't it you who prepared me for John? Wasn't it you who insisted that I should do everything to please him, wasn't it you who showed me how spanking could be a turn on?" Grace said as she moved in front of her mother. "Well, I am John's woman and yes I do everything I can to please him every time no matter where we are and now there is you and I ask you again do you think that you pleased your man?" Grace moved in and kissed her mother full on the lips. "It's an easy question to answer mom. This is what you really want isn't it, a threesome with John and me."

Liz slowly nodded her head. "Yes honey you are right about me and I am so ashamed of my behavior."

"Don't be mom, I enjoyed watching John fuck you just as much as you enjoyed watching him fuck me," Grace said before she kissed her mother again who slowly returned the kiss. "I don't mind sharing him with you mom but you have to be willing to admit that he is your man."