Who expected to fuck a beautiful stepmom through his playmate's house

I love my mother, Kana-san. The reason is that Kana-san is not her biological mother, but rather her father's remarried partner and the woman he has always dreamed of. After my father passed away, she raised me, a non-biological child, throughout my college years. I want to repay Kana-san, but at the same time, I feel more than just a mother to her. However, his thoughts are shattered by his best friend Kenji. While supporting my relationship with Kana, Kenji, who is envious of that relationship, quickly approaches Kana.