[Spock does not understand their relationship... so he believes this to be a rather hostile environment...

Spock becomes equally defensive...cradling the kitten gently in his arms, with one hand on his head, encouraging the hissing kitten to calm by rubbing circles there.]

You claim that you can take care of Mister Coulson, yet you have clearly made him upset with your words and disregard of his humanity.

[Spock addresses Coulson..] I would be amenable to taking care of you until you return to human form.