Welp, another dude of Nakia's taste. π±π€
This will be hard to ignore if he does flirt with them... Nakia's gonna need her big bro, or even hide in Ignihyde for a few hours. π
Or pass some time with Yuu to be more dorky than she would be usually. ππ€
Sa-kun is flirty in a non intentional way, his personality is very friendly and kinda playful, so you can interpret a lot of the stuff he says as flirty. The thing is, if you really invest in a some kind of relationship with him, that's when his tendencies are gonna start showing.
But in a normal context he is a nice guy being a normal college student! So you can choose, what kind of side you want to see from him ππ
Yuusa is too weird all the time, they might spawn some creepy stuff. I think Nakia is the most safe with big bro Kero, definitely π