"You should get home," he suggests, venturing: "Do you live anywhere nearby?"

He's not prying. If he wanted to pry, he could break into her school's database and obtain her address. He just wants her to get home safe without passing out anywhere or being taken advantage of. As it is, she's yet to drop out of her henshin and people are starting to notice, which has him stepping away from her to shrug out of his jacket and set it on her shoulders.