
yall have funny ideas about consent
Consent is clear, coherent, willing, and ongoing. A no means no, especially during sex. Consent can be withdrawn, so don't carry over the idea that "stop" and "no" actually mean "keep going" and "yes" into real life
And just because it's fictional doesn't mean its ok

Context also matters.
You do have a point that people shouldn't think that everytime someone says "stop/no" it will have the meaning of "keep going/yes" and no one should have this mentality.
Still, context is also important and in this specific case he's a submissive masochist that don't understand what he is and never experienced something like that before, so he's a little confused, but it's consensual and he enjoys it. In this case, when he says stop it's actually for being overstimulated, being embarassed about how he feels and not with the actual meaning of wanting to stop. He's just blurting the word out unconsciously due to the extreme pleasure he's feeling. I do hope they will eventually learn about safewords.ヾ(❀╹◡╹)ノ~
wait I started reading this as a joke buts its actually really cute