This one is really hot, the shocked arousal on her face (twenty seconds before mindbreak), the ripped tights, the sheer quantity of tentacles, the grimoire open but just out of reach, no chance to cast a go away, tentacles! spell. Poor girl. She might be like this until dawn, until someone finds her, and by then ... what will be left of her?
This reminds me so much of the story "This Cute Librarian Elfgirl Can Show You Where the Grimoires of Forbidden Sex Magic Are Kept" in Elf Girls, and could almost be an illustration for it.