He began messaging his dick through his robe while Shirley and Mark watched. Bud focused on Shirley, trying not to look at Mark. He wasn't gay, and he...figured here was sex with a lady and it had been years. Bud stood up and untied his robe, he semi-erect cock standing taller each second. At his age, he was 6 inches strong, and three fingers wide. He came in behind Shirley, she shuttered as he entered. "Ohh, your cock is so big." Shirley's lubed pussy was the wettest in recent memory for Bud.. But are you sure this shampoo's okay?" I asked. "It's just a generic brand I got off the supermarket shelves." She nodded."It's just fine," she said softly. I gently pressed her forward a little to get her under the stream of water and until her hair was soaked. She looked back at me with her eyes squinched tightly shut. I chuckled. I recalled that I'd always told Sherrie she looked like a pixie when her wet hair was plastered to her scalp. Without opening her eyes, she leaned back for another. I stuck my tongue in her little pussy hole and licked around in there for a time. Her taste wasn't bad, and there was still a hint of strawberry in it. Annie was trembling all over by now.I moved up and started paying more attention to the little bump near the top of her pussy hood. I ran my tongue around it several times and then licked across it. Annie's fingers were wrapped in my hair by now."Don't stop!" she panted as her trembling increased. I kept licking and running my tongue around her. . . she was my adopted sister but that was the same thing as being my sister.All of my friends knew that we were adopted and the guys always told me that I should hook up with Leigha. They liked to tease me about Leigha and I taking baths together. They said that it's not i****t because we are not related by blood. The more they said it, as we got older, the more I thought about it . . . but it was just thoughts. I never actually did anything to even hint to Leigha that I thought she was.