Responses

Yeah, my problem isn't with the creator. Having this happen in the story is no big deal. The problem are the fans who read this and assume that this is ok during BDSM. The author is just doing their job. The fans shouldn't be ignorant. I know that most of them won't look into it but they might get some information from what I said.
To tell the truth considering BDSM, this chapter wasn't even hardcore when compared to the other stuff out there.
From what I can see a lot of you don't realise that BDSM comes with rules for a reason so let me explain.
BDSM involved hurting your partner physically and sometimes verbally in order to pleasure both yourself and your partner. This is what creates a very thin line between a healthy BDSM relationship and an abusive one. For that reason we have rules we follow such as a "safe word." That's not always possible so I would always advice to always have some other way to show your partner you're not into it that you're both aware of it. If a partner ignores that rule and keeps going after you give them the sign that it's too much for you they are betraying you and not respecting you as a person. They are treating you as an object they can use to have fun.
In this case the context of the story implied that they only agreed to do this while recording. After the recording stopped, the uke was expecting for it to end yet the seme kept going. He wasn't considering the ukes emotions at all. It was only after he stopped that he considered if he went too far. If the seme wasn't lucky and the uke wasn't into it then this could have caused emotional scarring. I know people who had problems because of that. One of my friends has PTSD because his wife thought he was cheating and after their session she didn't stop and did a lot of things he didn't want her to do to him. In this case it wouldn't be that extreme but it would create a lot of issues.
If you do not realise that BDSM has rules for a reason then you should learn more about it.
EDIT: If you disagree then go on and comment why. I got one response from someone who doesn't really agree with me and I'm glad that I get to talk it out with them.
EDIT 2: Read page 5. The uke didn't give permission. He said that he didn't want to continue.