Unannounced Kitten Arrival

You came home yesterday to find your flatmate has adopted a kitten without discussing it with you. You are allergic to cats, and your lease says pets need the landlord's written approval. You do not want to damage the friendship or get both of you into trouble. Speak to your flatmate: explain your concerns and suggest a way forward.

Hey, have you got a minute? First, the kitten is really cute, and I can see you're excited. I just need to be honest about two things. I'm allergic to cats, so my eyes have been itching since last night, and I'm also worried because our lease says pets need the landlord's written permission. I'd hate for us to lose part of the bond. Could we ask the landlord together this week, and maybe keep the kitten in your room until we hear back? I'm sure we can work something out.