Dive into your creative stream
okay but can we all just Agree that regulus black was a VERY(!) clingy child. he used to just get attached to his elder brother’s leg and never let go until their parents came around. sirius, of course, did pretend to do anything and everything possible to make reggie let go (he was VERY fond of the idea that his brother needed him, sometimes it was the only thing that kept him going, made him wake up and go see regulus first thing in the morning (that is, of course, if reg didn't sneak into sirius’ room in the middle of the night because the thunder was too loud and scary or because of a nasty nightmare he had, hence was sleeping in sirius’ bed already)).
that being said, yeah, reg used to be clingy. however, that changed after sirius left him to go to hogwarts (of course, sirius’d take reg with him if he could, but he Could Not and for baby reg that felt like a betrayal). after sirius came back that summer he could no longer recognize his little brother. they used to read each other’s minds and now they weren't able to understand each other as if speaking different languages.