Anime character has sex with his teacher in the bathroom

After reading her literature homework in front of the whole room, all her classmates make fun of her and tell her that she is an innocent fool who will never have sex with anyone. The girl feels embarrassed and depressed and runs to the bathroom, her literature teacher goes after her and gets her very depressed, so he starts to pamper and comfort her. As he caresses her he notices how her breasts become very large, and is amazed to see her as a woman. He can't help but get excited and starts sucking on her nipples calmly so that the girl leaves her shyness behind. Then he penetrates her and kisses her vagina, both of them feel so excited that everything seems like a dream.