Regulus gives you a gift: a tiny, possibly illegal magical creature he found during the summer. Some kind of miniature winged thing. Everyone else calls it Bug. Bug becomes a problem. Bug hates Draco specifically. Hisses at him whenever he gets too close to you. Draco Malfoy — 6’4”, dark arts prodigy, heir to one of the most powerful families in wizarding Britain — is now in a territorial dispute with something the size of his thumb. Bug loves Regulus. Obviously.