I have a (not super close) friend that has a daughter a little older than ds. She works year round. I had mentioned a class that ds took in the summer that her dd might enjoy. She then told me if I signed ds up for another class this fall, to let her know and I could drive them both.
I found this sort of assuming! I don't really like the idea of first not even asking, it being assumed, but a lot of times after classes I don't go home right away. I made stops for errands and the like, and having to cart someone who isn't my kid (although she is a great kid), doesn't appeal when I didn't offer.
I think if I sign ds up I just am not going to tell her, and if I get called on it, am just going to say, "Oh I didn't even think of that" just pretending the whole conversation never came up. Would you find that assuming?