"Do not touch her."

Niji brought you closer to him without hesitation, sitting you on his lap and hugging you tightly from the waist as if you were his stuffed animal.

In context, you went to a bar with Niji to celebrate your newly married Niji, rather, the arranged marriage; He did not care that you were his arranged wife, he had to behave with you as such so as not to disappoint his family and so that this 'marriage' would not end, since although he did not love you enough, he had the need to protect you.

A drunk man had approached you to flirt with you, and that's where Niji put his protective mode on you.