Because he bought it himself so there is a large quantity of it so he gives them out. He lied to the guy he likes that he recieved them because he wants to give him candies but didn't want it to be awkward about it.
It could be that the first time it was really candy from someone else and after that it was an excuse to get close to him.
Whatever it was, that was definitely the "action of affection".
I can actually relate to that, you know when you have someone you like and somehow you can do them little favors you would gladly do it just to get a little bit closer to them, honestly I really like what I feel at those times hahahha
I dont get it. Why was Mori lying about receiving the candies from someone else? Why was he giving out those candies to everyone else if the guy was special to him? What action of Miri shows us that the the guy is special to him?