The only one who doesn’t realise that Yechan isn’t already totally whipped for Jun is Yechan himself (and maybe Jun as well). The way he went to town on Jun’s balls and dick like a starving animal said it all. And you’re right, their kisses are almost always initiated by Chani. Their kiss in the movies is a prime example. Chani was simply looking at Jun and felt compelled to kiss him. I just need them both to admit that they’re crazy about each other.

After Jun says he wants kisses from Chani, it just opened the floodgate. Notices that after that , 95% of the kisses are initiated by Chani? Not just when he wants to shut Jun up either. It's whenever Chani feels cute aggression towards Jun when he sees his face. (Even though I can't read Korean, Chani did the same in ch 50, when he was feeling conflicted and just had to kiss Jun).