HashiMada is a fast-growing yaoi pairing in Naruto fandom. It involves Uchiha Madara and the First Hokage, Senju Hashirama. In HashiMada, Hashirama is seme. Many people prefer HashiMada to MadaHashi, in which Madara is seme. However, it could easily work both ways with these two. Although this pairing isn't yet as popular as some others, it is quickly gaining speed as more about Madara and Hashirama is being revealed. They make a great couple, and can be protrayed many ways.
1) HashiMada fictions are my favorite thing to read before bedtime!