The Black mansion is huge and scary, way too huge and scary for a nine year old who has no one to play with is 'uncomfortable' in the dark. Regulus doesn't quite like it.
He pretends to be happy when Sirius was finally leaving for Hogwarts. He no longer has anyone to trouble him, pester him, eat his candy and randomly push him around. And neither does he have to fight for their parents' attention. It is supposed to be a joyride. Well, he is wrong. He is secretly crest-fallen.
After all his cousins had left, it is kind of annoying to be the only child surrounded by adults who never had enough time for Regulus. But now the portraits, the house elves, and the ghoul in the basement are his only play-mates. And they are not nice after having been suffered through for nearly three months now.
He doesn't want to admit it. But it's not like anyone's listening, right? 'I MISS YOU SIRIUS! I wish you'd just come back! You're smarter, taller, stronger and nicer than me, okay?! I miss you, Siri-Tumpac. We can play Pirates, and Faeries and even Werewolf vs Wizard. I won't complain, I just want you to come back.' Unknown to him, Father posts the Howler.
Turns out, it wasn't so embarrassing for him after all. Sirius on the other hand, forbade anymore Regulus Howlers to reach him.
Regulus made sure he embarrassed his brother frequently enough.
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