Nice shot all round. I feel instinctively that this is a B&W pic and colour would be wrong. I am often not sure why I feel this about certain pics. The usual rationale is that B&W concentrates attention on the people relationship while colour distracts but take the lovers away and it is still a better B&W pic than colour.
So I can't give a good reason but just know that B&W is right for me here.