Ideal relationship

I sat right in front of them in the bus. A couple clearly. He caresses her head, really slowly, savoring the obvious pleasure that her hair (short and curly) gives him (his head is shaven). She is standing straight beside him and he forces her head toward his shoulder to enjoy the touch of her hair on his face. I can see him rubbing his cheeks against her hair. She is holding a textbook.

What first attracted and captured my attention, though, is not their display of affection but the fact that they both have headphones on and are clearly listening to different Ipods. His is in a front pocket. She is holding hers in her hand.
They don't speak. Each closed in their own world.
Tapping together a different beat of a different music... A perfect metaphor for the ideal relationship.