I can't recommend one in particular, but I can clarify and say that St. Nicholas does talk about baptism and the eucharist in the one I mentioned, though it is within the larger context of the "life in Christ" and not solely about them. I didn't much like the one by Fr. John Meyendorff the last time I read it, fwiw (I preferred Preserve Them, O Lord: A Guide for Orthodox Couples in Developing Marital Unity by John Mack, but that's a different type of book). The other two (by Frs. Alexander and Meletios) I haven't read yet.