[There's a part of her that wants to remind him that she's the Mist Guardian of the Vongola Family, and despite being the same age as Ciel, she's more than capable of handling herself.

However, she says nothing, the only thing giving her away is her frown]

... I'll watch myself, but I won't be rude. I should watch him too then, if this is for Ciel's sake you're keeping an eye on him.