oh wow this sounds like a lot of fun! i can see lucas being completely oblivious to his sister's crush on him and thinking they were just friends so he wouldn't have seen an issue with hanging out with ian as well all the time! lucas would probably really open up to a big energy like ian's and let it bring him out of his shell which could be how & why they hit it off, like ian is one of the first people to not make lucas feel like a recluse LMAO. also if he hurts himself a lot still, lucas will know how to help ian recover!