The intention was to keep things under wraps for the time being, just in case your relationship didn't work out – you didn't want there to be a big deal with your friends.

And so the two of you had snuck away, down for a picnic a little ways away from the Whomping Willow, just out of whomping territory.

"Y'know, I learnt a charm that can turn this water into rum," he'd said, gesturing to your goblet of water.

When the smoke cleared, you made him vow to never try that charm again.