Macsterbating - When you do your thing through your pants in class and it's

When you do your thing through your pants in class and it's either to a classmate or a picture of a pregnant mouse

I was staring at my classmate like they were my next meal while I did my thing in class.

I looked at a picture of a pregnant mouse and got so distracted I forgot about the teacher.

I was doing my thing through my pants and it looked like I was trying to escape the classroom.