Another Year, Same Sister.

My sister an I are chalk and cheese, nothing in common and no shared interests. I managed to escape the hum-drum social housing and unemployment dead end life that she seems to relish, I run, I gym and I diet, she's huge, eats junk and waddles like a duck due to her size, but here's the thing... Every year just before Christmas we both feel compelled to treck 100 plus miles and miles to visit our parents in the old family home to deliver cards and g*fts. Every year it's just me and her (wife, husband and kids all left at home). Every year we say that she will sleep in the spare room and I will have the sofa.... And every year we always end up in the same bed having the most magnificent passionate sex together. We both look forward to it... I love feeling her big heaving fat body, big soft belly and rounded droopy tits close up against mine, and she seems to love my gym body for similar reasons.. We've always fucked, it used to be more often when life was tough when we were teens in the era of mass unemployment and strike action it was all we had that was free and warm and loving, but now with sepearate lives it's become a special and deeply meaningful yearly g*ft to ourselves... One night of fantastic, dirty secret loving amazing sex.