Rino is starting to understand the meaning of what her mother wrights, her attitude is changing to men especially one man, she even forgot to change clothes because she was fantasizing to much, Ayane had just been with the same man Rino was dreaming of, that's why her legs were shaking so bad that Rino noticed. Thanks, it's a cute and interesting story.

自分に接近する男子より大人しく、自分をいらやしい目で見ることもなく、

いらやしく→いやらしく

後、「大人しい」は物静かで従順な人みたいなイメージになります。主人公は「大人っぽく、又は、大人らしく」の方が当て嵌まると思いました。