u/Hazardous-potato

I originally started watching the anime on Netflix and only recently found out that there was a season 2-4 and I just finished all of it and now I’m wondering if they have more of a connection in the books? I ask because at the end of season 1 it looks like they kissed but go to season 2 and they still just have a comradery/parent-child relationship. I feel like they should have made the end of season 1 scene look more like a hug than a kiss if it is that way. Also is it easy to find the manga as a thing to read on the web? (I’m sorry if this sounds dumb, the only lore I have to go off of is the explicitly stated stuff in the anime)