When I get a boner, my glans fill up to match the girth of my shaft, are soft, but they do not get big and shiny

They get big and shiny when I'm genuinely horny. Like I'm literally talking to a girl and she's interested in me

If I'm masterbating, I need to be lying down and flexing my glutes to get the head to fill up, while also providing it stimulation

When I stand up, it goes away and I feel tightness at the base of my penis under between my legs

One thing I've noticed is that these days I'm getting overly obsessed with the fullness of my glans. I don't "enjoy" my boner, I just start inspecting it right away, and it starts to go away