It is like a secret.
No one knows you're suddenly holding hands, no one knows how fast your heart is beating (maybe the person beside you knows, but you're too nervous to ask.)
You can feel someone else's breath on your lips, you can feel someone else's heat on your skin. You can feel someone else's thumb caressing the back of your hand.
(You can feel the tension in the air, the moment before it happens.)
And then...
The kiss.
(Heaven.)