Someone who've read the novel
What happened in this part?

The gist of it is that he's establishing the master-slave vow with Chisato.
Pictured here is the moment when he created four clones and took her virginity; kind of a humiliation/domination play and all that.

If you'd like to know more, there's a summary available here.

Valentine322 said:

The gist of it is that he's establishing the master-slave vow with Chisato.
Pictured here is the moment when he created four clones and took her virginity; kind of a humiliation/domination play and all that.

If you'd like to know more, there's a summary available here.

Now I understand. Thanks a lot!