Yes, there are quite a few. You can start by looking on popular fanfic websites like Fimfiction. Some fanfics might focus on their adventures together, perhaps going on a journey to discover new party ideas or musical rhythms.
The contrast between their personalities. Pinkie Pie is so energetic and spontaneous while Twilight is more reserved and studious. When they interact in fanfics, it creates a lot of fun and engaging situations.
You can try looking on some popular fanfiction websites like Fimfiction. There are often a wide variety of My Little Pony - related fanfictions there, including ones about Bubbleberry and Pinkie Pie.
There could be a 'bubbleberry x pinkie pie fanfiction' where they plan a huge party for all the ponies in Equestria. Pinkie Pie brings her party - planning expertise and Bubbleberry could contribute something unique like special bubble - themed decorations.
Themes of cooperation and mutual understanding are quite common. Since they have different personalities, stories might focus on how they overcome differences and work together. For instance, in a story where they have to defend Equestria from a threat, they use their unique abilities and perspectives to succeed. There can also be themes of celebration, with Pinkie Pie's party - loving nature and Shining Armor's presence adding to the festive atmosphere.
There are quite a few 'rainbow dash x pinkie pie fanfic' out there. Some focus on how they support each other during tough times in Ponyville. Like when there was a big storm and Pinkie Pie used her cheerfulness to lift Rainbow Dash's spirits, and Rainbow Dash in turn protected Pinkie Pie from the strong winds.
Another theme is the discovery of self. Through their relationship, both Pinkie Pie and Cheese Sandwich might learn new things about themselves. For instance, Pinkie Pie might realize she can be more organized with Cheese Sandwich's help, and Cheese Sandwich might discover he can be more outgoing when around Pinkie Pie. This self - discovery is often intertwined with their relationship development in the fanfics.
One popular mlp pinkie pie x twilight fanfic is 'A Magical Bond'. It beautifully explores their friendship in a new adventure. They face challenges together and in the process, their bond deepens in a very heartwarming way.
You could also try Archive of Our Own (AO3). It has a wide range of fan - created content. Just search for 'Pinkie Pie x Cheese Sandwich' in the search bar, and you'll get a list of relevant fanfics. Some might be more focused on their relationship, while others could be part of a larger story arc involving other characters as well.
Maybe Pinkie Pie is kidnapped by a group who wants to use her party - planning skills for their own evil purposes. Her friends, like Twilight Sparkle using her magic and Rainbow Dash her speed, try to track her down. They might also discover some secrets about Pinkie Pie's past during the rescue mission.