Here’s an example:
Lets say a man marries a woman in the Church. The man’s faith is very little. At some point after, the couple divorces. The man decides to make a civil union (marries) with a woman. The Church does not grant an annulment, she says its completely valid. This man forms a family, lets say with 2 or 3 kids with this last woman. At one point he converts deeply to the catholic faith. He now realizes that he shouldn’t be married to this woman. He tries to find his real wife (the 1st one) but no success of finding her or no success of reconciliation. He also thinks that, even with reconciliation, separation from his 2nd “wife” will do great damage, specially towards the kids. He deeply desires to receive all the sacraments, specially the Eucharist. He proposes to his “wife” that he wants to live with her like brother and sister, meaning, no sex, no kissing, no sharing beds, etc. The “wife” agrees.
NOW, with all of this said, is this an exceptional situation to someone to receive communion?