
The reason why there is no sex scene is because this isn't the "real version".
The author wrote this for entertainment on Pixiv and I don't think you are allowed to post porny stuff there.
But luckily it's getting serialized in a magazine now so the chapters will get longer and there will be some changes like for example the missing sex scene.

there is an option to put your pixiv drawing under nsfw though
I've already read all the chapters at Myreadingmanga.info and this is such a sad yet beautiful short story.