"Please, let me just insert the tip!", but in the end, my frustrated friend's mom inserts it all the way to the roots.

Koichi comes to visit his classmate Yosuke's house, and when he finds out that Yosuke's mother, Juri, is masturbating while taking a bath, he is so excited that he starts to stroking the spot. Realizing this, Akari gently criticizes the embarrassed Koichi and proposes an unexpected relationship, saying, "Let's feel good together." Koichi refuses to be afraid that his relationship with his best friend will deteriorate, but he reluctantly accepts Juri's forced suggestion, "If it's just the tip, it's the same as not doing anything," as his husband keeps working, as he wants to somehow resolve his frustration.