The protagonist has got into the habit of being a meddlesome busybody towards the man who saved her at a drinking party.

He's an older student at the university she attends, and it would seem he's also possessed by the supernatural blood of a snake.
Nonetheless, thinking that he wasn't that much different from anyone else... she is drawn by the kindness he displayed when saving her.

But something she says makes him change in an instant.

His expression, his demeanor, and his... appearance.
The features of a snake. The scales, the eyes, the tongue, and...

Bitten and injected with his venom, the protagonist is unable to escape.
She is violated in both holes by his snake like hemipenis... and driven mad with pleasure.

As she repeats like a broken doll her feelings of love for the man, he simply sneers at her with contempt.

Coming to understand the obsessive emotions of love and hatred the man has for her...
They fall together...