@paul-nebeling huh?
Yue have trust issues, but if you are a girl and have her trust, she have no issues having a girl trying to jump into Hajime's pants.
The novel even stated that itself that Hajime have no intentions having a harem of people that Yue doesn't approve of. But Shea only got to be special number 2 because Yue pushed her and Hajime to just do it already.
More like Hajime is the territorial reluctant one. due to betray and trust issues sure.
Aishia is very much the same way. If you are special to Rio, she wants to make Rio find more happiness.