Yuuya leaves because he actually has trust in his gf to listen to whatever the fuck this guy has to say, then tell him off.
We dont know anything about this guy so telling him to fuck off immediatedly isn't neccesary
Rio's blush, if anything, is an annoyed blush, look at her fucking eyebrows, she's uncomfortable
I agree with Mivas though, this being so short in length for these kinda chapters is a bummer.