*cough* Umm, @JB , did you mean to release this immediately, instead of waiting the usual 2 weeks? Is this series an exception to the group's release delay policy?
Called it. Although, it does appear to be transcending the trope with the two of them about to form an Abs Admiration Society... Comradery, rather than competition, if you will.
Pictured: A demonstration that the human body has enough blood to run higher cognitive functions or the male reproductive system, but not both simultaneously.
Sounds like the people who haven't had a boss tell them they "need to take a day off" have never worked a skilled job where burnout is a thing and it takes years to train up an experienced worker*... if you can even find one with the right starting skill-set. I've seen it happen.
* And never...
A lot of people just don't seem to get that the cornerstone of Renya's personality is that he's a grouchy, crotchety-ass, get-the-fuck-off-my-lawn motherfucker. It's really the source of his charm; otherwise, he'd just be Generic Shounen Isekai Protagonist A.