Imagine that Jaskier accidentally gains the ability to read Geralt’s mind and he finds out that Geralt has a constant 24/7 internal monologue that is goddamn hilarious.
Hear me out:
Villager: help Witcher 7 people have been eaten by a mysterious beast in the woods
Geralt (mentally): you’d think they stop going out after the 3rd dead body but NO
Jaskier has to constantly keep himself together so he doesn’t just collapse with laughter. He is absolutely SHOCKED at the kind of things Geralt is thinking about all the time. And Geralt is also super emotional but does such a good job of hiding it.
Like Geralt would see a cat and walk by it but mentally he’d be thinking about how soft the cat is and how he wants to pet it and it’s just so cute. Later than night Jaskier brings Geralt the tavern keeper’s cat and he keeps his face neutral but his thoughts are so happy. Jaskier would just keep doing little things that Geralt might not even really know he wants because they were just passing thoughts.
Bonus Points if Geralt has no idea that Jaskier accidentally mind-melded them and just thinks his bard has become super observant or something.