Nodoka likely already has romantic feelings for Sensei:
Just in her own way.
As for what her route may look like, well, she's tried to get Rin to get with Sensei:
Helped Futaba lose her virginity, helped Rin get fingered by Otoha, helped Chika and Touka get back to bed after they passed out in Sensei's room, and more or less helped Kirin, Noriko, Makoto, Molly, Rin, and Sana, get off in her Meet & Fuck.
Nodoka more or less seems to desire that everyone just fucks Sensei and not get upset about it:
Her and Miku seem to be the main pro harem girls.