Ah, the blackmail, the edging torture...All of it just to get him to pledge to be her toy, eh?
I feel like just the blackmail photo would have sufficed, but I guess it's better to be thorough about these kinds of things.
OOOOOOOOOOOOOH ... 'Senpai Noticed You'. In fact, some of the dialogue (no spoilers) suggests she laid a well-dosed trap, and you were drawn to it without hesitation ..... "DAYUM!"
Now, unless Ippei-kun somehow engages "Man Up", he's destined to be subservient to Kaname-senpai ("sperm tank,toy,sperm bag, etc."), forever. Somehow that seems so wrong, but from her facial expressions when they got down to sexy time, she did seem to enjoy it, so there's a chance that just maybe some sort of balanced relationship may be established in the future.
In The End, even as I patiently wait for more "Ojou-sama X Butler" goodness by the same artist, I say unto this work: "APPROVED!"
In all honesty, being a toy to be used sounds about as good as being a lover to a femdom degenerate like myself. Taira Issui really delivered with this one.