Reiji & Bucky (and maybe Steve)
Reiji probably would have been able to keep up the charade longer if Bucky hadn't adamantly declared that he was Batman. He was actually impressed that he had lasted as long as he did as he started to laugh uncontrollably. Between giggles he let out a yelp as he was punched in the shoulder.
"Ow! Careful I'm a very fragile James" He teased with a pitiful pout. Which, with him still having the other boys face had to have been quite a sight. There were other people walking by and giving odd looks at seeing what looked like two Bucky's facing off. "Happy Halloween! How do you like my costume!"