I had to learn that my body is not asking gor food, but for a 15 min nap.

Think on gifting him something inexpensive for you, bake them something or something like inviting your son’s friend to dinner at home. It’s healthy to reciprocate within your economic situation. That way it doesn’t become charity.

Couldn’t be done something like a reversed book encryption? Something that is plain text and perfectly readable but that you can use to decrypt a message?

Wouldn’t binary transfer in base64 be undescifrable as they could be files in a proprietary format?

Shan ara chronicles has just that and I searched it in tvtropes: https://tvtropes.org/pmwiki/pmwiki.php/Series/TheShannaraChronicles#:~:text=The Shannara Chronicles is an American post-apocalyptic fantasy drama television

The Reveal: Not that the characters particularly care, but Safehold turns out to be the 3000 year old remains of San Francisco

I don’t like following people I like to follow topics