It wasn't supposed to happen.
Anna was still upset about losing Seth. She was vulnerable. But when she came to Ryan for comfort, he couldn't turn her away.
She fit easily in his arms and he could feel the heat radiating from her body. When she pulled away, tears staining her cheeks, he did the only thing he could think of to comfort her.
He kissed her. He promised it wouldn't happen again.
But after another hour of watching Summer and Seth play kissy-face, Anna needed more.
So she went to the one person that could give it to her.