By using the aristotle rhetorical triangle, first, from the angle of LOGOS, the reason why i deserve a free ice-cream every week of class is because lecturer have income, and they have the ability to treat students ice-cream for every week of class for this semester, but students dont really have income, so they cant really afford to buy one for themselve every week, although students have their own pocket money, but, those money have to use for printing or buy materials for their assignments.
Besides, from the angle of ETHOS, i believe that lecturer can treat students a free ice-cream because it is good for both of lecturer and student, for example, the relationship between students and lecturer can be better, maybe not just like students and lecturer, but like a friend. Other than that, maybe students will treat lecturer back next time, so its like treating each other. For lecturer, they much more experienced than students, they might know that treating students an ice cream probably can make them feel warm or kindness of lecturer.
Lastly, from the angle of PATHOS, this semester will be harder than the previous semester, thus, students will feel completely stress, so, we students need ice-cream treat from lecturer to make us more relax, enjoy and happy while learning. For me, treating is actually not just about paying money buy you something, but its about your heart. Lecturer do something that not everyone will do it even a common friend, so the person that get treated will be happy, and the person who treat will probably happy too. Its like happiness between each other.