Gives me so many feelings. Because this isn’t just ~growing up,~ it doesn’t - didn’t - happen by itself. It happened, mostly, Kurt and Blaine together, learning from and with each other, and yes, that was so much of a story, even though we’ve only seen the barest bits and pieces of it.
He knows how to have hot sex now not because his body’s changed, not even because he’s practiced and gotten ~good~ at it, but because… he knows what’s hot to Blaine, he knows (and Blaine knows!) what Blaine does that’s hot to him, they’ve done this before so much. And they can talk about it now, like this! Blaine can switch Kurt’s brain off with a few kisses in the right place and Kurt can say how hot it is because it’s… part of their life, and they love it, and they can use it - is it weird to say fluently? - now. Yeah.