My Lucky Day

We're well as a family, but my father holds the purse strings tight. Both me and my sister at home and attend the local university. My father collects porcelain figurines, and he had one he especially liked. Then one day late last year I was home no lectures, and my father was home and somewhat unhappy. His favorite figurine was a fake, he hadn't paid very much for it and got from an estate sale. He had only recently got it and his friend who was an expert was away and pointed out it was a fake, made in the 80's or early 90's. But he knew where a genuine figurine was for sale and he and his friend went off to secure the figurine leaving the fake sitting on the small table near the front door. He had told me to bin smash and bin it as he left, and I decided to get snack first my sister came home in a lousy mood and chucked her books onto the hallway table sending the figurine flying and it smashed. My sister was totally horrified. I arrived as she started to panic. I decided to tease her, and she asked me to help her and me being me asked what's in it for me. She responded telling me I do anything you want; I was really enjoying teasing her. I enquired so you would let fuck you, if I take the blame. Yes, was her quick reply, which took me by surprise, and I got a hard-on straight away. I agreed quickly cleaning away the broken figurine and took my sister to my bed and fucked her. She was a good fuck, but I'm no expert. Neither of us were virgins, anyway as our mother was away visiting her sister. I decide to press my luck and get another fuck from my sister. Then we showered together, and my father rang to say he was having dinner out and to our own dinners. I told my father I had broken the figurine and my sister was shocked how calmly I had said it to him. I finished the call with my father and my sister asked me what our father had said about the figurine. I said he told me it was a fake and he had gotten a real one to replace it and was going to smash it on getting home. I added that's why it was on that table; my sister and I had dinner and she told I could fuck her again before father got home if I wanted. I wanted and we had sex again and then showered together. Nothing was said about the figurine until our mother returned, with my father saying it was a fake and I had smashed it and binned it. My sister still doesn't know that I knew it was fake when she broke it, we haven't had again since. But she lets me give her a feel up every now and then, so I think there's a chance.