Ask him if he would like to take a trip to Ireland to celebrate his graduation. I’m sure he won’t be starting work immediately, but if he already has a job it’s an easy excuse for at least a 2 week vacation. You could offer to show him around where you live and all the cool spots. Introduce him to your friends and do some of the things you all usually do for fun. Then you can take a trip to the touristy spots, which is conveniently a great excuse to get a room for night in the city, ya know, to make sure you have enough time to see everything and not worry about the travel time and such. Then for the end of the trip, just spend the time relaxing, and hanging out together. Give yourselves the time to get comfortable doing the day to day routine, give him a chance to experience what regular life in Ireland might be if he were to stay a bit longer.
The problem with making things you make free, is that people as a whole are terribly selfish and lazy. They will take anything free and claim them as their own. Individually, tons of people will respect the wishes of original creators, but it only takes 1 single person who doesn’t care who will ruin it. The problem is the Internet has billions of 1’s. You can ask please don’t copy my freely available thing all you want, but it’ll never happen. There will always be those that will repost as thier own. From ideas to assets, nothing is sacred when it comes to the masses.