John "Soap" MacTavish had a secret, one he shared with no one. Not even his best friend and teammate Simon "Ghost" Riley. John knew of his sister, speaks to her often, what happens when Ghost finds out this hidden detail about his best friend. What happens when Y/N MacTavish and Ghost begin to get closer as Y/N learns the life of 141 task force. (This is a Y/N x Ghost story, with she/her pronouns I do hope you enjoy!)