Nucleic acid force fields are also subject to this decomposition problem, and the strength of interaction between two nucleobases is dependent upon both the functional forms for the energies and the parameterization procedure used. The purpose of the work being presented here is to therefore study how these traditionally neglected interactions (polarization, electron overlap, etc.) could be better represented in a molecular mechanics (MM) force field, specifically when applied to RNA nucleobases. Focusing on a parameterization strategy based upon an energy decomposition analysis (EDA) for density functional theory (DFT), we propose a novel model for RNA nucleobase interactions that incorporates explicit polarization and charge penetration effects via fluctuating electron densities. The presented force field is similar to that of a fluctuating charge model, but instead of using conventional point charges to represent electron/nuclei populations, we focus on using atom centered densities to also recover electron overlap effects. As this work is based upon an AMBER force field of RNA, we are coining the name AmberFD to describe our AMBER based Fluctuating Density model.