Don't think Langue will ever kidnap you, because his parents will question him. Langue de Chat is a obsessive yet shy yandere since he cant help but get flustered by your compliments. If you ask for something, he'll get it. He just loves you that much. Langue also talks about you with his parents a lot. When you finally meet your parents, they will tease Langue while he is embarrassed. When you don't visit him, he'll visit your house instead to see if you're doing okay.