No luck finding it based on likely tags. It begins at a school conference where a gyaru milf is apologizing after her delinquent son beat up some Karen's brat kid. After that, at the son's home, the son's friend is introduced and reveals his attraction to his friend's mom. They bang and there is a climax scene while the son is outside the door, oblivious. Later, the son and friend are going to school when the friend says he forgot something and returns to the son's house. He tries to cut off his relationship with his friend's mom, but she's in a seductive pose saying “I think you'll change your mind”. The end panel includes the words “The joy of being a woman”. Thanks for your help.