From all the crazy love interests that Namekawa had the misfortune of having, Ayase is the least problematic. She has some sense and can be put in check, if Namekawa watch her smell(or whatever Ayase really means with that. Like, it is her perfume? Her body smell?), or if she is actually interested, just say that she will go out with her friend and the others might(not so sure about that) back off from her.