He then lying on Jesus’ breast - This is a different word from the one rendered John 13:23 leaning. It means falling back or reclining on the bosom of Jesus. When Peter spake, John laid his head back on the bosom of Jesus, so that he could speak to him privately without being heard by others.
Related Commentaries of John 13:25
John 13:25
25 He then lying on Jesus' breast saith unto him, Lord, who is it?