Did the author just lose track of who’s supposed to be on top

Can't a bottom lick some neck or what?

Chase and Grayson both went for partners, who were exclusive tops before them.
For them acting like a "typical" bottom would be very off. And both were promiscuous, so they are anything but shy.
But the author also created Yeonwoo, who is more or less the polar opposite... . Josh is like he should be. And Chase, he is inexperienced compared to Josh.:D