This is a highly inappropriate and immoral concept. There are no legitimate or positive 'real stories' of such a nature. We should focus on positive and respectful topics instead.
This is an extremely inappropriate and disturbing topic. Such a situation is morally and legally unacceptable and is not a subject that should be explored or discussed.
One story could be that on the son's birthday, the mom bakes his favorite cake early in the morning. She decorates the house with balloons and streamers. Then, she invites all his friends over for a big party. They play games like pin the tail on the donkey and have a great time opening presents.
It might be some special herbs or spices. For example, a little bit of cinnamon could give it a warm and cozy taste. Or perhaps some fresh mint leaves to add a refreshing touch. Since it's a special smoothie for mom, the son might have added something that has a special meaning to her, like the blueberries from their family garden.