Did you actually think that through before you said it? Would you actually do that?
Did you think through whether you'd be going out of your way to acquire a new blanket specifically for/because of me, or bringing in one you already have, which would feel like an almost personal/intimate connection to use?
Were you planning on putting it in a drawer and taking it out for my sessions, or leaving it out all the time? Were you planning on it being there for anyone to use, or something you only brought out for me?
Have you ever done anything like that before?
Would you regret having offered it once you thought through all those practical aspects of it?

I'm still not sitting in the chair.