What a cute tyrant. Also, Tsundere and Vanilla always go so well together.
Ahh...I think they have a nice relationship too. She needs someone she can rely on to not buckle under the pressure of Capitalism, and he happily obliges her.
That ending though. Servant forever, eh? Well...While it's nice that she acknowledges she wants him by her side forever, there's no chance for a rank up from servant to...Husband?
There Can Be Only One for Violet Ojou-Sama, and it seems that she *cough-cough* "insists" that Ishikawa be "her" servant and hers only ... of course, opinions may vary as to whether perhaps one day, his position might be "upgraded" (say-no-more, say-no-more).