So sometime last week this boy in math was saying how he would hit anyone who said something bad about him and I was like well you can't hit me cuz I'm a girl. And he said, "I guess not but I can still tickle you!" I told him I'm not ticklish (which is true) so he tried to find my ticklish spot (I don't have one). It was pretty much groping..... I felt really uncomfortable. So this week he scooted his desk up behind me and said "great now I can annoy you!" And so for the rest of the class he and his friend were making sexual jokes and touching me and stuff. What should I do?