Extra story for 無口な図書委員とセックス漬け。夏休み篇～セックス漬けの二日間 released at C102.
Supposed to be contained in the Fanza released version but for some reason didn't get uploaded by the up-loader of this gallery:https://e-hentai.org/g/2669865/8d99b9fc44/.
So I decided to spend some extra bucks to grab it from fanbox. According to https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_284823 the extra contain 11 pages. So I am assuming the fanbox version is exactly the same to the Fanza version.

Source:https://hht5nuhp.fanbox.cc/posts/6633199
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sexyyyyyayaya

Base +6, nuts987 +13