Well, it could be a mobile hub for rare Pokemon items. Maybe the ice cream truck driver is secretly a Pokemon collector and uses the truck to travel around and trade with other trainers. He could be selling special ice creams that give Pokemon a temporary boost in power or stats.
It could be a place for trainers to gather. Just like a Pokemon Center but more fun and casual. Trainers can share stories about their Pokemon battles while enjoying ice cream.
One horror story is about an ice cream truck that would drive around a small town at night. The music it played was distorted and creepy. People who saw it said the driver had a strange, pale face and his eyes seemed to glow in the dark. Whenever kids got too close, they would feel a sudden chill. It was as if the truck was luring them in for some unknown, sinister purpose.
The idea of the ice cream itself being tainted or cursed is also quite scary. For example, if the ice cream is described as having a strange color, a bad smell, or making people ill after consumption. It turns something that is usually a source of joy, like an ice cream from a truck, into a vehicle for horror.
One scary ice cream truck story is about a truck that would drive around at night with no lights on. Kids in the neighborhood heard the familiar ice cream truck jingle but when they looked outside, all they saw was a dark shape. When one brave kid went closer, the truck suddenly sped off with a screech, leaving a strange cold feeling in the air.
The most terrifying part is often the unexpectedness. Like when the ice cream truck that seems so normal at first does something really strange. For example, in some stories, the driver acts in a really creepy way.
One possible fanfiction could be about Kaito stumbling upon an ice cream shop in a magical realm. The ice creams there have special powers. Kaito tries different flavors and each one gives him a new ability, like the ability to fly with the strawberry - flavored ice cream. He then uses these powers to save the day in that magical world.
I'm not sure if there are many Pokemon fanfictions specifically focused on 'oral, cream, lemon'. However, in the vast world of fanfiction, some creative authors could potentially use these concepts in a symbolic or comical way. Maybe the lemon could represent a sour situation a Pokemon gets into, and the cream could be something that helps solve the problem, all described through characters' oral communication in the story.