Yeah Logan hates the aftereffects of dark. But Zach hates the taste of it all together, like he would dry out rather than drink it. Zach will just shake his head and be like. "Your blood is really the last thing I'm even thinking about right now." 

Haha I know that's why it will be funny. Logan will smirk. "Actually a lot gets past me. Your smell just pulls my attention everytime."