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For a moment he was violently angry. During the month that he had known her the nature of his desire for her had changed. At the beginning there had been little true sensuality in it. Their first love-making had been simply an act of the will. But after the second time it was different. The smell of her hair, the taste of her mouth, the feeling of her skin seemed to have got inside him, or into the air all round him. She had become a physical necessity, something that he not only wanted but felt that he had a right to. When she said that she could not come, he had the feeling that she was cheating him. But just at this moment the crowd pressed them together and their hands accidentally met. She gave the tips of his fingers a quick squeeze that seemed to invite not desire but affection. It struck him that when one lived with a woman this particular disappointment must be a normal, recurring event; and a deep tenderness, such as he had not felt for her before, suddenly took hold of him. He wished that they were a married couple of ten years' standing. He wished that he were walking through the streets with her just as they were doing now but openly and without fear, talking of trivialities and buying odds and ends for the household. He wished above all that they had some place where they could be alone together without feeling the obligation to make love every time they met. (2.4.13)
Winston quickly falls in love with Julia; from here, the feared bond of private loyalty is created.
She knew the whole driveling song by heart, it seemed. Her voice floated upward with the sweet summer air, very tuneful, charged with a sort of happy melancholy […]. It struck him as a curious fact that he had never heard a member of the Party singing alone and spontaneously. It would even have seemed slightly unorthodox, a dangerous eccentricity, like talking to oneself […].
"You can turn round now," said Julia.
He turned round, and for a second almost failed to recognize her […]. The transformation that had happened was much more surprising than that. She had painted her face. (2.4.29-31)
Julia delights in engaging in small-scale, private rebellions against the Party, such as engaging in sex and wearing makeup.