積ん読 (hiragana つんどく, romaji tsundoku)
(informal) the act of leaving a book unread after buying it, typically piled up together with other such unread books.

also posted on ao3.

feel free to send me a prompt on my tumblr
1.) Give me a pairing.
2.) Give me an AU setting.
3.) I will write you a less than 1k drabble.