Tomoka is forced into a different engagement, she doesn't want to do it since the other guy is older than her (
even tho he is a good guy) and she still loves Tohru very much. She knows Tohru will not drop Ryti for her, so the solution she comes up with is to make Tohru impregnate her even if he doesn't end up marrying her

She traps him in the gym's storage room and tries to seduce him in her underwear. He almost folds after she tells him he doesn't have to take responsibility and that she really wants a baby with him, but backs out in the last second. After telling her this will hurt Ryti, she appears and tells them "Why are you doing it in a dark place like this, let's go home and have sex there together", stunning them both
Sorry this was not really the ending, but i had to share this scene, it was hilarious

(
They didn't end up doing it at home btw)
Anyway, it ends like this... Tomoka want's a polygamy relationship, Ryti wants Tohru for herself but doesn't mind having Tomoka around, Tohru accepts Rythi's love and they become true lovers, but doesn't want to abandon Tomoka. Fuyuka comes up with a plan which breaks of Tomoka's engagement and will make Tohru the future head of the family. The 3 of them continue to live together... And that's it!
It's a bit open ended when you think about it...
Oh yeah, the tomboy Asuka is the only one that really lost
