We sat there eating dinner in an awkward silence, none of us had really seen each other all day and we certainly hadn’t talked about what happened last night. I didn’t know if mum was cross with me or not following her finding out l had sex with my sister or if my sister had had second thoughts about finding out that l was fucking mum and that had led to me fucking her.   ‘so’ mum said suddenly, ‘we have a problem, don’t...