  We discuss B-type tensor product branes in mirrors of two-parameter
Calabi-Yau hypersurfaces, using the language of matrix factorizations. We
determine the open string moduli of the branes at the Gepner point. By turning
on both bulk and boundary moduli we then deform the brane away from the Gepner
point. Using the deformation theory of matrix factorizations we compute Massey
products. These contain the information about higher order deformations and
obstructions. The obstructions are encoded in the F-term equations, which we
obtain from the Massey product algorithm. We show that the F-terms can be
integrated to an effective superpotential. Our results provide an ingredient
for open/closed mirror symmetry for these hypersurfaces.
