But I'm pretty sure you can pick whichever if there are two words in the middle. The game started off as a 5 letter game until people just stopped using words with 5 letters.
I have the rare Otome games Darling I and Eisai and the 108 Guys R18 to choose from. I'll only share it with someone who answers my requests for my games Luckydog1 Doujin Game - Taiyou to Tsuki to Inu to Usagi or Shikkoku No Tsuki