My sister and I went to visit my grandmother just after we both got out of college. Grams was dressed in only a white t shirt. She was sitting on the couch with her legs spread and I could see a shaved pussy. Her tits are really big and I could see her nipples pressed against her shirt. She would bend down a lot and I could see right down her shirt. My sister asked if she could too. She has little tits but big nipples.
I sat down and my sister jumped on my lap. She rubbed her ass on my cock and it got hard. I pulled my cock out and my sister drops her panties and we fucked like that and Grandma saw what was going on and asked if she could too. My sister let her and grandma whispered in my ear if I ever fucked an old lady.
She grabbed her hands and put them on her tits. My sister saw this and asked if she can get felt also that she would suck me off if she could. So I did. I asked grandma to get off my lap and then I pulled out my cock and let both of them suck me off. My sister had little tits, puffy and pink nipples. That night my sister had some college friend over for a sleep over.