/sneaks a peek
[He instantly steps back, embarrassed.]
H-hey, don't do strange things Ashura-niichan!
[He wasn't in the least angry, no, but he was completely flustered over it. How was he supposed to keep up his 'bratty' image if the man kept being so nice to him? He wasn't used to it! That's why he needs to overreact over these things!]