Love stories are really quite hard to write, I am currently writing one myself. It's especially hard if you haven't experienced true love. Though love isn't like the movies and in romance novels as it is portrayed to be. So you must decide first, fictional love, or real, true love. Depending on what you choose, you write the major love scenes first. Then build off of them in detail and viola! Though it's rough thinking up love scenes so look up some famous love scenes, like in movies, books, plays. Anything that seems like a good love scene to you. Though romance novels are quite tricky you have to manage it depending on the age your going for. Usually romances are based for adults, who more relate to true love. Though many teen inspired romances are written by witty writers who no just how to advert the teens thoughts of the traditional love. It makes the books more interesting and not constantly on the influential track.