Starting today and until Thursday, whenever your characters experience caring or loving feelings towards someone else, they'll feel inclined to touch them - headpats, hand-holding, hugging, any sort of fluffy!touches you can think of.
The intensity of said feelings would determine for how long this lasts, too; if what your character felt wasn't that strong, it should be a lot easier to stop the effect and quit the physical contact. Same if they try to focus, or if they got distracted.
That's all! As usual, feel free to ask any questions o/