Since I have seen that the original version is significantly larger than the one already uploaded, I am now uploading it. And if you follow the link to the collection below, there are 2 more pictures with the first 4 characters of the series on the Pixiv page. In case anyone is interested.

Manico
https://www.pixiv.net/en/users/68130164

The artist says that all his works are free and freely available, but if you still want to give him a little support:
https://www.buymeacoffee.com/ManicoCoffee

Here is an overview of the other parts of Manico's After Office series:

After Office Sex - Vol. 1 - Nagisa
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After Office Sex - Vol. 2 - Momiji
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After Office Sex - Vol. 3 - Lisa
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After Office - Vol. 4 - Sayuri (You Are here)
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After Office - Vol. 5 - Misaki
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Source
https://www.pixiv.net/en/artworks/103087592