What are you thinking when you and your so are staring into each other's eyes for a while?

I realised I have this habit to just stare into my SO's eyes when we're cuddling. He just stares back when I do this and I love it. It feels like I'm really seeing him. Like really seeing him. When I look into his eyes I finally get why eyes are this huge thing associated with feelings etc.
But I haven't had the chance yet to ask him what he's thinking when we stare into each other's eyes for a while so I just wanted to drop this question here...
What do you guys think about when you and your SO are looking into each other's eyes?
What are you thinking when you and your so are staring into each other's eyes for a while?
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