Sons girlfriend here for the first time

[Theblackdogagain]

They are both 14, he's been to hers and now she's coming here for the day. I've made space in the conservatory for them to hang out for some privacy but within sight line. I'm cooking something for dinner that hopefully she'll like. What else can I do to make her feel welcome?
Son has been told what is and not allowed. There's snacks and drinks for them to help themselves too. Bathrooms have been checked for cleanliness.

I don’t think they’ll be worried about how clean your bathrooms are 😁

Honestly, you’ve overthinking it. Just be friendly, keep an eye on them without being obvious and pop in uninvited from time to time to ask if they want a drink/ snack 😏 (deters them from getting up to stuff).