I Can't Keep Up With My Regressed Younger Sibling's Emotion

"My sworn enemy of a little brother has regressed. Did he secretly take some kind of medicine behind my back? Whenever he sees me, he cries, apologizes, and makes a fuss about protecting me. I'm starting to miss the days when we'd fight explosively over a single chicken leg. But this punk is starting to act stranger and stranger. Trying to set me up with a Casanova. Plotting against the smiling angel sunbae. Trying to ostracize my friend of ten years. Why are you meddling with my social circle!? --- It wasn't just my little brother who became strange. "I don't want to be apart from you for even a second." My usually aloof friend is clinging to me. "Worry about me a little more. ...