Ask Culture, Guess Culture, me, and Tea

I find the concept of 'ask culture versus guess culture' fascinating. I find it really useful for understanding social interactions that otherwise didn't make a lot of sense to me. I'm normally very much an ask culture person. I say what I mean, and I mean what I say. But I've realised one 'guess culture' thing I have. If I say 'do you want a cup of tea or coffee' to someone who is, for one reason or another, briefly in my home, that's not all I mean. It is a genuine offer of tea or coffee, but more than that it is also an invitation to stay and hang out, and a request for further company. I don't know why I don't say 'I'm enjoying your company. I'm not busy for the next while, wanna stay and hang out?' But I don't.