As much as I know it'd never happen because it doesn't seem to be the path this VN wants to take, I do wish we could be the man that both Lucy and Charlotte want and need, I think it would only help bring the sisters even closer together, but if at the end of the day it ends up being single route endings only (which I'm highly suspecting it will be) then I'll choose Charlotte because
1. The mc and Charlotte share a past concerning Emma the model that binds them more than any other
2. Because I get to be a parental figure to the 2 girls who are both adorable and just need some fatherly TLC in their lives.
The reason why I choose my main route as Charlotte is it feels like the story is heading that way naturally anyway and I find deviating from the story's main route tends to show cracks in the fabric.
I'm still holding out hope that I don't have to break the heart of either one of the sisters honestly as that I personally think would hurt the story a little, especially given how smitten both of them are becoming with him as time passes between them.