[X] A single Slytherin – Tracey and you have never verbalized your friendship. Her facing down her own house-mates to show flag was as much a sign of support as you could imagine. Your rivalry is unbroken, but it was built on mutual respect. Ask her to join you at the Lake. She will get to read some of your spell notes, while you explore the Lake. She'll be more than happy with that trade-off … even if you are not sure what kind of monster you will be creating with that.