[Warded to Romilda and Astoria]
Start by warning Franklin about what he might be about to walk into? And tell your parents about his age so they don't do something embarrassing when they first see him. And keep calm! And remember, you can always leave, especially if it's casual, and you can suggest a "neutral" place to keep it casual like a pub or restaurant.
That's about all I've got. I've never brought someone home, either.