Hi
Sorry for the late reply!
I'm part of the developer team and just found your comment by coincidence. :D
We only made Lexan and Duran romancable partly because we didn't think about the possibility of making more romance routes. (But also we didn't have much experience in making visual novels and thus would probably still be working on it to get the additional contents for more storylines done... )
I'm seriously honoured that you'd like to romance Prowen and Rett too. T///T
Thanks so much for playing our VN!
Your comment made my day!