either the author don't understand about construction worker or he/she never had friend with construction worker. the more hardworking construction worker the more hornier they are, maybe at night they tired but they will make sure before work they will had sex, especially veteran with more than 5 year their body has adapt to regain stamina faster heal faster. because their testo hormone keep producing extra by working heavy construction. this equal with going to gym, the different gym focus on power, but construction worker focus on endurance in muscle.
The male mc really not represented as hard working veteran construction worker, because 10 year hardworking he has to had body like jack, is it better when mc got problem with erection because of something, than just tired. that crap story. there is more of story problem but other already cover it.
But i must say i like the graphic, i just don't like the story.