An idea for either a mini-arc in DreamSMP or a DreamSMP fanfiction is that Fundy and Foolish work together on a project as business partners. Quackity tells Charlie about it but forgets to add the 'business' part of 'business partners' because he's always associated partners with business.
Charlie, who associates partners with lovers, believes that Foolish and Fundy are dating and decide to celebrate learning about this by planning a romantic evening for Fundy and Foolish.
Fundy and Foolish go through the romantic evening without realizing that it's meant to be romantic, just eating dinner and chatting about their project as friends. It's only when the two of them are back home that they realize that they technically went on a date.
The next morning, they ask Charlie about it and Charlie reveals his misplaced hypothesis about them. Fundy and Foolish explain that they are business partners, though they thank Charlie for the nice evening they had. Quackity repeatedly headdesks when he realizes that he's the reason for the misunderstanding in the first place.
I would have wrote this down as a Archive of Our Own story but I have so many unfinished stories on my account that I have forbidden myself from writing anymore stories until I finish my unfinished ones.