https://www.dlsite.com/girls/work/=/product_id/RJ01068381.html

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[Synopsis]

After being offered as a sacrifice to the mountain, she was reincarnated in the demon world.
An overbearing ''egotistical'' demon king appeared before her.
She married him and ended up having a child, but... the demon king believed that children could be made through kissing.
She decided to teach him ''real sex'' in order to gain his favor.
He was so pure despite being egotistical and the way he tried to hold back from feeling good was adorable... she thought she would get hooked.
But... when she tried to escape the castle for some reason, she found the demon king standing there, with heavy emotions.
He was a mess with anger and obsession, and he grabbed her... she couldn't escape anymore.

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