>>3073139The songs imply a hell lot. About all sorts of pairings, and that is just my point: Free! is in it for the teasing. You get mooks on MakoHaru but you also get mooks on RinHaru because that doubles your sales.
As for feeling jealousy, hell, that happens to virtually all Free! boys at one point or another. Do you think Sousuke is canonically gay for Rin? Because he sure was extremely jealous of Rin caring so much for Haruka.
As early as season one, Rei has a fit over Haruka still being so caught up with Rin.
And Nitori's entire existence as a character is to obsess about Rin, hard, heavily and almost nonstop.
Of course they have feelings for each other, they are very good friends in an anime that gushes nakama power from every single frame. Is it romantic? You can read into it, I won't deny it. But there is reading involving so it's not canon.
And to stop this discussion, since it isn't going anywhere, here is a double combo, Litchi style.