I actually thought the implication for Sauri was less that he still has feelings for Aini and more that he's become a siscon (Sandra even uses the word complex in the same scene)
Having read the WN, another aspect of Amy's brainwashing is that you have to have some form of 'positive' feeling towards her, be it lust, pity, or basic attraction. So something as simple as "she's got a cute face" or "oh the poor thing" is enough to ensnare men. That's why her charm ability...
I think Riko (the short hair bitchy girl) is pregnant. She was sick for a couple of days apparently and the last chapter had her oogling a random baby on the street.
It kinda feels from the last chapter that the story is setting up her downfall, what with her whole "the throne will always be...