that dose sound interesting but that would most likely be an evil route thing for dorgania. it would most likely destroy dorgania for the planned time jump thing. i will admit its a good idea for an evil route but what could be the good route for it… that would be a really hard thing to think of a good route where you could impregnat her. but there are so far only three where you cant do that if you go with the good route so far. and that would be moriko, Irinlia, and maybe grey if you dont keep him as a girl. grey is kind of iffy.
well. you cant get to the upstairs of the dorgania castle right now. so they could have a daughter you could influence to kill or succeed them. hell there could even be a neutral route for it. just deside to have her do nothing. though that would be kind of boring in a way. but i just came up with this with no real deep thought into it.
sorry if i was kind of harsh on your idea its really good but i played renryuu ascension alot. like 5 run throughs as of right now and almost all actions you can do to people have a good or evil choice to them. your idea has a really hard way to make the good route alowe you nock up the queen.