My mother didn't bluff and I believed her.We then spent the next two hours or so shopping, I was terrified that wewould meet someone I knew and I stay...d close to my mother and tried tomake myself inconspicuous. In two shops we were complimented on mybehaviour as a polite young lady.We went to a department store and my mother made me try on a variety ofoutfits; I must have looked a sight because my face was on fire. Despitesome threats we didn't actually buy anything and we then had something. “But it is a beautiful Cunt.”She went crimson, but smiled and looked down at her shoes.“So next time I had better give you a good nibble down there,” I said."No! I said we can’t do that again.”“Okay, but you do owe me a return favour.”Grace looked uncomfortable and was even more crimson. But I took note of the fact she didn’t say she wouldn’t.“Hey! I’m teasing you again, we had better get you back, probably enough excitement, I mean walking, for today. But if you want to talk or ask me any. In a way having her outside allowed him to concentrate.He pushed again, putting more pressure upon her anal sphincter. Again, and he could feel it almost give way. Readying himself, he thrust hard, causing it to give way, allowing his cockhead to enter halfway into the hole. Another thrust, then another, and his bulbous head was in. In this position he admired her ass, noting the way his dick connected her to him. He also noted the way her ass tried to push him out, using her anal muscles. Every time he’d touch my stomach his hands would move closer to my tits. I felt his dick harden against my ass and sent a shiver down my spine to my cunt making it wet. I moved my ass against his dick and he started humping my ass and made the bed creak. I heard his sister stir above us and told him we would have to finish later where we would be alone. I leaned over and kissed him passionately and told him goodnight. Then we went to sleep.The next morning we were all sitting eating breakfast.