Seems like these are some good mates there, and I'd bet the other guys would be a bit surprised but also supportive as they see how close these two have become. I'm thinking Luca had a bit of that in the back of his mind even before the trip, and that was the opportunity to explore it further, and that it's been a good experience for both of them in finding the situations they enjoy and work for them. One nice thing is that while there's been a small amount of hesitation at times, there's never been a negative response or regret after-the-fact, as often happens in situations like this. There were a few negative naysayers but I think the reception (having just finished reading through the entire thread) has been pretty positive and appreciative. Some questioned being able to handle that first time like that, but I've had a few first timers where it became obvious pretty quickly that they were going to be good bottoms and pretty well-lubed themselves. Looks like Luca knew he wasn't quite that ready but desperately wanted Finn and so he made sure to be prepped with the bottle of lube when he was making it his turn to bottom.
I haven't had any travels or friends like that, though I have had some other good experiences while traveling that made for good memories, so I can understand how Finn can reflect on this and recount the story. He hasn't mentioned his own personal thoughts on the matter, but I think it's pretty clear that he's opening his eyes to his best mate now meaning a whole lot more to him, however they choose to define it.