C'mon I watched the main series and now back again for the gaiden, pretty sure fanservice is to be expected.
I like it so far, didn't realize at first that this sets up the first meeting with Aiz and tomato Bell. So we'll be looking at the Loki familia side of things in the same timeline? That should be interesting.
Also, Riveria commenting that Aiz has toubles of her own is repeating in my mind as though that's what the gaiden will throw some spotlight on, which will be great of course if true.
Don't remember seeing in the main series, that last part of Aiz blushing and pouting over Bete's teasing, went back and checked and yep it wasn't there. She's kinda cute there