I have taught CCD for 10 years, but always 5th or 8th grade, where "reason and logic" have a fertile field for planting. Second grade is perhaps, in my opinion, the most challenging of all the grades due to the depth of the subject matter "transubstantiation" while at the same time, very limited reason and logic to grasp such a huge concept.
How do you begin to have 2nd graders grasp that a substance can be, and feel and taste like "A", but in reality be "B" ?"
The only "physical" example that I keep arriving at that may allow a 2nd grader to grasp at is the Kiwi fruit, which looks like a round green fruit, but tastes like banana or strawberry to different people. How can GOD get a banana and strawberry flavor in a round green fruit that is not a banana or a strawberry?
Only GOD knows, and only GOD knows how HE can get HIS SON into a small host, that looks, tastes and feels like bread, but is in fact HIS SON.
From an adult point of view - weak - but from a child's "maybe"?
Good luck and my prayers will be with you.