https://www.dlsite.com/books/work/=/product_id/BJ714397.html
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Warmth of motherhood

I'll teach you everything I know!"
One day, her son Ken brought home his friend Katsuragi. When his mother, Yurika, saw his smiling face, she was fascinated by his fair face and beautiful skin.
As they exchange contact information and correspond with each other, she begins to have sex with Katsuragi.
He was surprisingly good at sex, and Yurika was drowned in the pleasure she had never experienced before.

好像已经出到3话了，不得不说虽然画功一般，但还是很好用的

Base +6