I myself have contributed to the Blushing Killua meme for fun, but let’s be honest. Killua is a chill person who is very okay with physical contact and often initiates it himself. I think this is how their dynamics would be. Gon would be openly affectionate with lots of cheek kisses and hand-holding and Killua’s fine and casual with that. Killua prefers simple gestures like touching and leaning into Gon, rather than initiating “romantic” things like kisses. Killua kisses are something of a rarity (and usually kind of sly), so Gon, who is absolutely crazy about his best friend in the whole world, turns into an excited blushing mess whenever he sees one coming. I see him as the type that gets so happy he just starts laughing. And Killua at first is like, “What’s so funny??” and gets mad because he thinks Gon is laughing at him for, idk kissing wrong? wtf Gon! But Gon keeps assuring him he’s just SO HAPPY that Killua loves him.
The second reason this not-quite-a-comic exists is because I wanted to draw Gon in this shirt. Dogs say “WAN” in Japanese, which sounds like “ONE” in English. Killua got him this shirt because Gon is a pup who is Number 1.