Anakin had no idea what was going on with the boy from the internet so far, and he did think of him as a boy, somehow, even though he was probably only a couple years younger. There was something open about him that suggested...he didn't know.
But he knew he had to actually talk to Luke. Well, Luke would hopefully choose to stay with them too, so talking would help but...this went beyond that. He'd mentioned what was happening to Padme, and that he'd probably have someone new for her to meet, but he came out first to go and get the door when he reached out in the Force and felt...
Well, there was that sense of being COMPELLED again. But in a good way. There was something PURE working here, and it was kind of overwhelming. How anybody managed that was making him curious too.