Seriously, though. The main reason they start traveling together is because he wants the Shikon jewel for himself. Later on that just becomes their main excuse to hang out together. And while Kagome still abuses her sit priveliges on occasion, it becomes very rare.
Yeah--I can see where Anlushac11 is coming from with the comparison of the brothers. Do they see their human compatriots in the same way? Probably not. But it'll be interesting to see what all happens with Fluffy-sama and Rin later in the series...