Borusara see ya

I am super late, btw I have a story about this picture:

after the defeat of kawaki, burrito wants to travel the world, making himself a vigilante-esque, just like his master (read/watch sasuke shinden) and make an alias, Tobu, salad asks burrito if she can join his travels, but he refuses, he said this is his responsibility as a successor of sasuke after he (somehow) dies. Burrito learns about his master's habit of poking salad's broad forehead, and he gives his first poke to salad

P.S.: some anime scenes and manga panels foreshadows about the canonicity of this pairing