I will discuss the reaction mechanism associated with two-particle transfer reactions in a simple one-dimensional model. The reaction process is generated by two moving wells and we follow in time the evolution of the two-particle wave function, initially concentrated in one of the two wells. At the end of the process one can single out the population of the dierent nal channels, namely elastic and inelastic (with the two particles still in the original well), one particle and two-particle transfer (with one particle in each well or both in the second well) and one- and two-particle break-up (with one or two particles in the continuum). When a residual short-ranged pairing interaction among the two particles is included in addition to the moving potentials, one notice a clear enhancement of the pair transfer as compared to the single one-particle transfer. By acting on the parameters of the model (depths and sizes of the wells, velocity of the moving wells, distance of closest approach) one can simulate dierent physical situations. In particular one can investigate the eect of the pairing in diluted systems by tuning the parameters to obtain the situation of weak-bounding in one (or both) of the colliding systems.