Did a bit of reading on English sources after reading the tl notes. No idea how reliable this info is, but I found this bit here

According to the stables staff, Lord Kanaloa was in love with Curren Chan.
The stables staff treated the two horses carefully because Lord Kanaloa could go into heat when they were together.
By the way, Curren Chan didn’t seem to have much interest in Lord Kanaloa.