Voted down selfcest because at no point does she fuck herself or a double of herself, though if it is selfcest someone explain why and I'll retract my down-vote (and then vote it up, obviously).
The artist of this work doesn't know the meaning of torture(拷問). But this uploader had understood well or didn't know it, but rather right. He didn't rightly set a torture tag. In fact, the japanese title and context of this work are different. By the way, the title should be abuse or 折檻(sekkan). I unfortunately could not translate sekkan. In addition, neither tag seems to be provided. Now, don't tag tentacles. Just 3 images is too few.