There is a wealth of resources regarding sexuality and thematics for adolescents in general available here: https://www.youmo.se/en/
also, Big Mough comes recommended by the city of reykjavik, which has lots of stuff regarding sexuality and gender issues, but not all in english.
i want to emphasise training how to use a condom, finding out the correct size is something that’s on his to do list. Proper hygiene is also learned (my parents didn’t give a shit and it caused me problems far longer than necessary) - tell him if he needs to shower, body odor changes fast during puberty, and it’s easy to be nose-blind to your own smell.
I saw someone recommend giving a gift card for a sex toy - i think that’s a good idea, the sex drive in puberty was constant and to be honest at times annoying and distracting,
from what i understand, a decentralized bluesky is nothing for an enduser at all.
TL;DR: the cost for an enduser to run a bluesky instance will soon be prohibitive because of the amount of storage needed owed to its shared heap architecture. but what it does is to provide a “credible exit” - if users lose trust or the company shutters, there’s nothing in the way of another organisation picking up the mantle and continue from there on.