In a small bowl, combine ½ cup of heavy cream with ¼ cup of sweetened condensed milk. Use a whisk to blend thoroughly until smooth and slightly frothy, about 1-2 minutes.

Fill two tall glasses with clear ice cubes, ensuring they're packed to the top. Let the glasses sit for a minute as you prepare for the next steps.

Slowly pour 1 cup of cold Coke into each glass over the ice cubes.

Drizzle 2 tablespoons of toasted marshmallow syrup and 1 tablespoon of chocolate syrup into each glass with a gentle swirl.

Spoon the prepared sweet cream mixture on top of each glass, creating a fluffy, cloud-like appearance.

Serve immediately with colorful straws or spoons, and optionally sprinkle graham cracker crumbs on top.