This is a great question! I first heard this possibility mentioned by Dr. Tim Gray on one of his Bible Study series on the EWTN website under audio archives. The main reason It’s so intriguing is that in vs. 31 after Jesus blessed and broke the bread and distributed it, “With that their eyes were opened and they recognized him.” The ‘eyes are opened’ and recognition language is identical to that used in Genesis after Adam and Eve ate of the tree of the Knowledge of good and evil. Since this Early Church Fathers taught that the Cross is the Tree of Life, and the Eucharist is the fruit of the Tree of Life (and with the Eucharist we are given eternal life (ref Jn 6:54)), it makes sense that another couple would eat from the “Tree of Life” and gain eternal life, rather than death as in the case of Adam and Eve. Also, if these disciples were a couple and they were quarreling beforehand, after receiving the Eucharist their relationship seamed healed, whereas in Adam and Eve’s case, they had a balanced relationship beforehand, but after eating the fruit, their marriage relationship was broken through sin. I think one could see it as how our marriage relationship to Christ through the Church is strengthened and healed by receiving the Eucharist.