Yagami-kun no Katei no Jijou

Well, in short, the mother looks like shes 14, and the kid is openly in love with her—loli x motha-con. His teacher, too, is in love with her mother, and so the love rivals duke it out in classroom, as well as plotting the downfall of their common enemy, his father. The father has a secretary who is in love with him. But once she discovered that he has such a young wife she turned her attention to his son, who is now torn between his own mother and a naive, motorbike riding girlfriend. Later on, the class gets a new student who looks exactly like the mother, whom everybody falls for. Except that the student is a he...