The only reason I don't join you in the vanilla tag is cause sensei says on page 9 "It's hard to believe I had to ram it into you by force the firt time" that makes me think he raped her at the start and we are seeing the story when she is already a slave to him.
That is honestly rather ambiguous. I'm inclined to agree with you, especially seeing how this is how these stories usually go with characters and relationships like these, but it could also simply mean that their first time was rather difficult but she's getting used to his size now.
"What a dick"? You essentially get eye candy and you're blaming the guy?
But hey at least it's all consensual and she seems to genuinely like the Sensei. Also he's not really a dick or anything.
I also really like the artstyle so it was definitely a nice release.
Welp, the tag is gone now.
Yeah I assume he did rape her at first, they just didn't quite...show it and just mentioned it in passing. Kind of easy to miss these sometimes. Funny how a single phrase can change your entire outlook on a release.