https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_337913/
https://www.dlsite.com/maniax/work/=/product_id/RJ01145876.html

>Shirayuki Hitomi, whose boyfriend is a year older than her, is worried about the lack of progress in her relationship with her senior.
>So she proposes to her senior that she'll give him a naughty reward for the next exam.
>As planned, they progress to the point of licking each other's private parts, but they don't engage in actual sex.
>However, their act is photographed by a senior from the same school, who asks Shirayuki to delete the photos in exchange for her body, saying,"For your sake, too..."
>Her dream of giving her first time, which she was so close to achieving, is destroyed by a man other than her senior...

Base +19