The Gryffindor must have decided that he could trust this girl with his things, because he took his trunk with him but left everything else in their place. A music gadget that her muggle-born friend had informed her was called an 'iPod', a quill and a scrap piece of parchment he seemed to be doodling on - and that book.
Emilie's gaze fixed on it, remaining there for a while. She shifted it to the cabin door. He had gone to change, surely she could just take a little look at the book? It had intrigued her so, and she felt the need to know what this 'nothingness' was. It might be able to explain her repulsion to the potion; it was possible that she had some form of allergy, like everyone always tried so hard to convince her, but no one had ever heard of an allergy causing the potion to smell disgusting. It was something more.
She couldn't wait any longer. The blonde snatched up the book and started to read the inside cover. From this, she gathered three things: the research in this book was gathered by an American wizard, there is something in the Muggle world known as 'aromanticism' and that it was possible she suffered from this condition (whatever it was).
Relief hit her with a huge amount of force; a train crashing into a leaf, which was happy enough before, but then it gets carried along for the ride. And it was a good ride. Finally, there was some explainable reason why amortentia smelt the way that it did, and she just needed to find out what it as before –
An interrupting cough sounded from the doorway. It dragged Emilie kicking and screaming from her daydream, and she flinched. The book she was so engrossed in slipped out of her hands and landed on the floor with a rather loud thud.
"I- I'm sorry." The Slytherin managed to stammer in the direction of Arun. "I was just really interested in your book and…well, I guess I should be going now that I've invaded your privacy. Sorry." She repeated the word again. It was supposed to be an apology, but is she was honest, it was a relatively feeble one considering the circumstances. As she stood, Arun didn't talk, he only moved to pick up his book.
"Here." He held it out to her. "I'm not going to force you to stay, but I've read this book already. It was just some light reading for the train. Take it."
Emilie stared, open-mouthed, at the Gryffindor stood in front of her. He had just caught her invading his privacy, and his immediate reaction was to give her a gift? This didn't make sense.
"Oh. Thank you. Are you sure? Thank you!" The blonde's smile stretched across her face completely as she took the book from his hand. "I just - amortentia smells really…funny to me. I don't smell what anyone else does, not freshly washed clothes like Lucy or roses like Thomas. And I thought that this might explain it." She examined the book for a little longer, before realising that she'd just gushed her feelings to a Gryffindor that probably didn't care. "Sorry, I know you didn't ask. I just needed to - I don't know."
Arun smirked at her, she was getting flustered, and it was amusing. It was the behaviour his friends would probably label as 'cute', and it was to him as well, just not in the same way. "It's okay. Just read it, and then come and find me or something. I want to know what you think."
Emilie thanked him again, before exiting the cabin. She hid the book under her jacket, then sneaked it inbetween the robes in her trunk when she arrived back at her own cabin, still smiling from the encounter.