I wasn't expecting a 3rd entry in this series, but I'm not complaining.
Next time we see Yoriko, she's gonna be trying to figure out a way to make Shinpo fall for her, completely ignoring the fact that he's already in love with her.
Serypti, my (limited) understanding is that in Testament of Sister New Devil, it is heavily implied that the MC bangs Mio and the other girls on something resembling a regular basis.