Bringing things back to easier themes, your options are wide open. Oral stimulation is commonly enjoyed by most people, and some prefer to give more than receive, or vice-versa. Your only challenge is to portray a scene where oral stimulation is used.
Laid next to someone you care for a lot, arms wrapped around you, fingers intertwined. There are few things that feel better than this moment, and passion overtakes you. You want them immediately, but want to stay this comfortable with them as well. How does your character combine the comfort and passion for their lover?
If I asked you what was your favorite thing about your partner, what would it be? The way they roll up their sleeves on a nice button-up shirt? Their beard? Their butt? Their smile? Your challenge is to write a short story where someone's favorite qualities are celebrated.
This could mean a lot of things to different people. A source of your desire. Something that makes you hunger as it stimulates your senses. You want to move forward and indulge, but something prevents you. It could be you weren't given permission, it could be a restraint of a physical or mental kind, or even a barrier. Details are up to you, so long as something desired has been denied to your character.
What lies behind that locked door? Why is it that you're free to open any other door and explore any room you like, but not this one? What does your mysterious host keep in there? What do they use the room for? Once you look through the keyhole, will you be satisfied with just looking? Or would you like to step inside?
You never know who you're going to meet in your day-to-day life. Maybe you get a customer or client who's especially cute, or makes you laugh, or bite your lip when you look at them. But let's suppose the meeting place is on a train. The reason and encounter are up to you!
Voyeurism and exhibitionism isn't anything new. Even the most vanilla of us get a thrill off watching a couple in action, or having eyes on you while you fuck. What perspective do you get to be a third-party observer? What goes through your mind when you see someone watching you in such erotic bliss?
Have you ever thought about doing something different? Have you had suspicions that the couple next door is into something kinky, but the thought has you feeling excited or curious? How do you find the courage to approach someone and tell them that you want to know what it's like? How do your expectations compare to the experience itself?
This one is may be a bit more specific, but there is still plenty of room for interpretation. A brat can be a tease, they can provoke inclinations, even refuse to do as they're told. But the goal is always the same: they play until they get what they want. What will you make of that?
Close your eyes and imagine a theme park where all the attractions are based on your favorite kinks. They could be rides, carnival games, or even performances. If your kink were here how do you imagine it, and how would you participate? Would you participate with a partner, or be paired up with a stranger, or two? Welcome to SexyLand! Where we all have fun.
Certain things stand out when you see someone you're attracted to. Sometimes it's a scent, a beard, the color of their hair or eyes, their voice? Tattoos are commonly noticed, and while it doesn't need to be a central theme of your story, your challenge is to present a tattoo as distinctive to someone. Good luck!
You may have a lot of time to yourself right now, but what about those moments when you need to have some time to yourself, and there are only a few minutes on the clock? Or when the few minutes you have before you're seen make the experience even more exciting? Whether for personal pleasure or the thrill of exhibitionism, your challenge is a story where your MC only has a short time to take care of their own needs.