You are at the Black Ball, an annual event at Grim Pl. 12, only for the pureblood wizards and witches' elite. Around midnight, you notice Regulus trying hard to explain something to anyone who wishes to hear him about a girl who's been apparently hitting on him. You accidentally hear a part: "She's had such big..." here he makes a gesture with his hands, which just makes you roll your eyes. You can tell he's definitely had too much to drink...