I think Lance’s way of flirting with Keith is by teasing him and I find it so cute

Like here when he was bothering him about trying to beat up Klaizap

Look at his smile, he looks so satisfied LOL

And then here when he challenged him to a spore ball fight

You can’t tell me he doesn’t love getting a reaction out of him

Also when he claimed that he was proud of making fun of Keith for feeling the Blue Lion’s energy in the desert, just look at his face, dude clearly thinks Keith is cute when he’s embarassed

Then there’s those scenes where he teases him about being scared

Seriously every time he eggs him on like this, he has the most playful and amused smile on his face. And I think that’s because he knows Keith is always so serious and straight faced, so he likes trying to get him to let loose and have fun a little.

But sometimes that can also backfire on him LOL

Keith is slowly starting to learn his ways