Secret Never To Be Told

One for sorrow. Two for Joy. Three for a girl. Four for a boy. Five for Silver. Six for gold. Seven for a secret never to be told.     I've been thinking for sometime if I should tell this story. It did happen a few years ago and at the time all parties swore to privacy.  I've decided to break the promise and tell the story.                                                                                                        A few years ago I was on a trip and decided to stay a night at my brother in law and his wife's house. His wife cooked a wonderful meal and after we sat outside drinking wine around a fire. We drank 3 bottles of wine,then my Brother in law brought out a bottle of rum. By the time it hit 3am I was totally wasted. My sister in law took my arm and we tried to help each other inside. We fell over into the grass and she landed on top of me. Within any warning she kissed me on the lips. I responded by kissing her back. My brother in law came and helped us inside. We all staggered up the stairs and I was about to turn into the room they had stated was mine when they took my arms either side and escorted me into their bedroom. I watched as they stripped each other and kissed and he suckled on her breasts. Then she turned to kiss me and slowly removed my clothes. We were all stood there naked. I pulled her onto the bed. We kissed and licked each other giving each other numerous orgasms before cuddling up and going to sleep.She slept   in the middle with myself and him either side. Waking up in morning it felt really weird like you'd committed some terrible sin. Nothing happened between my brother in law and me other than we saw each other naked. We discussed it over breakfast and we decided as a group to never tell anyone about it.