Another Bed with the Bed
Scholars have said that seeing another bed alongside the existing one, whether similar, better, or worse, indicates the dreamer marrying another woman. The interpretation of the new wife's condition varies according to the appearance of the additional bed, and this interpretation does not differentiate between free women and bondswomen.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam
Note: These are traditional scholarly interpretations (ijtihad) drawn from a specific classical source — not a binding religious ruling, fortune-telling, or a prediction of the future.