Moon Saturn squares in composites make for stingey emotional responses from each person to the other. One of the partners likely acts as a parent figure to the other.
That's the worst I see in the composite, but it's something to keep in mind over the years if this is a durable relationship - which Moon Saturn composites can be. But often, even in durability - there is a drying up of affection that occurs over time - and it could likely end up being more of a business relationship marriage rather than one of profound love.