Hi! I'd love to help you with your English! In return, can you also please treat me to a drink/dessert/dish? Thanks! :)
もし、英会話の時に言葉とか忘れてしまて手伝いますよ!楽しい英会話しようね!〜よろしく!:)
(Lesson fee is ¥10,000/hr + transportation + cafe fee. Thank you for your kind understanding.)