Has Everything Already Been Written?
I'll echo the others and suggest that you write what interests and moves and amuses and excites YOU. <br>
I don't think it's different from writing without erotica and/or tickling. Is it hard to write about cookies because Proust said it all with his madeleine or about mortality because Shelley nailed it in "Ozymandias"? You bet. But we keep trying because we keep living, darn it!<br>
With a bit of work, you'll find a rhythm and meter and level of detail that'll say "tickle" to you in your stories. You may toy with perspective, too, assuming a 'lee one time, a 'ler the next, or being a bemused observer the third time. You don't have to invent a new language. Just be persistently playful when you write and the reader will be tickled, too.<br>
I've found that when I write characters that I care about, in a plot that challenges me, that the tickling is easier to write and fits the story comfortably. Sometimes, the set-up is the hard work; other times, making the tickling evocative is the task. I know both are right when I don't feel the need to cut-and-paste anymore. (Admittedly, for some tales, that moment almost never seems to come.)<br>
Do I sometimes think I fall into cliché or the obvious? Yes, despite my efforts to exceed them, it does happen. When that bugs me, I rewrite until I've wrought something more vivid and fresher. Sometimes, tho', it doesn't trouble me. The "ha-ha-ha" and other tickling tropes seem like familiar, well-worn but still comfortable articles of clothing. There are times I just want to wear that old pair of jeans, and not be decked out like Jay Gatsby.<br>
If your writing pleases you--and the tickling therein diverts you, audience reaction will take care of itself.