it reminds me my school time (i don't know whether it normal or not), in my class in middle and high school, all boys did thing like that, "fuck each other" all the time (with clothes on of course) in classroom, "fucker" and "receiver" both seem if they were enjoyed. And I always got boner during this game, they laughed but nothing big deal. Sometimes we played that and afterwards whole class jerking off together. It was fun memory tho.
