Laura & Sara were roommates alright, however, Sara was a lesbian, who wanted them to be more, while Laura was still working out her own orientation. You see, Laura wasn't happy with who she was, let alone not certain how she was attracted to others.
One day, in the library, Laura was doing research on the folklore of Medieval Europe, pulling various books out, when the librarian came up out of the blue and handed her a dusty but yet gilded book, saying, "Maybe this will help you with what ails you..." smirking all the while.
Not wanting to be rude, Laura took the book. However, after she left, Laura muttered, "Creepy." Thumbing through it, it appeared to be a book full of mythological creatures, spells, potions, and reagents all laid out like it was an encyclopedia. "Now this actually is useful... What's this?" Noticing a peculiar passage that seemed to printed in glowing text, it referred to a spell of change, listing the magic words, "Msag'ro uo ynehw mrofs'nartl luoy," denoting it requires "the bliss of coupling" to work. She then noticed the text and what it meant backwards. "Ha. Gross. But still, if magic was as simple as speaking backwards, then playing records in reverse would have opened several gates to Hell already..." However, it made Laura think about her plain Jane identity and her life, asking herself, "But only if it did work. 'Msag'ro uo ynehw mrofs'nartl luoy.' It is fun to say though..." As she closed the book, she failed to notice the glow in those words brighten, nor could she see her eyes glow. However, she did feel a building arousal as she left the library, book in hand, thinking, "Maybe I should take Sara up on her offer to 'experiment...' Might get my mind off my worries."
That night, Sara started to pleasure Laura intimately, feeling the sensations build in her. Finally, the moment happened, and a secondary tingling ran through Laura alongside her orgasm, the magic she incanted earlier taking hold.
Now, the big secret to Laura was she had always wanted to be something else, and that something else was on her mind at the time... but what is that "something else?"