For two women, a version of the Two Sisters can be fun if you re-write it to end with the sisters pushing the young man in the water. Let Him Go, Let Him Tarry is also fun.

Since you said Scots was OK, how about Culloden's Harvest. The tune is in the DT midi book. It's a beautiful tune and a heartbreaking story - maybe good for later on in the session when people are getting melancholy!