You went to the beach with your friends. And one of them posted a picture of you when you were shirtless.

Next day you went to school, and sat down at your desk. You saw some of your classmates staring at you.

Soon the bells rang as others payed attention to the teacher now. Your enemy sat next to you. After some time of you ignoring him, he put his hand on your shirt while lifting it up a bit, revealing a part of your stomach. His cheeks grow red as he did that.