
He is chained and can only go to the bathroom when the boss takes him constipation is one of the side effects of holding it in and urinary infection too after all he's holding both pee and poop
Dude could just put a longer chain or let a chamber pot under the bed but pee kink I guess we don't question porny yaoi logics

He has 3 times in the day in which he has the opportunity to go to the bathroom, so I would say he would be fine, people normally poop once or twice a day and the minimum that he should pee is 3 times a day to be healthy so I don't think he would be constipated, maybe he would be constipated due to stress tho?

I must say, i was in a mountain hiking camp for 6 days and 5 nights. Totally embrace the nature and even the "toilet" was sponsored by nature. Some of us was veryyyyy reluctant to go number 2 and one even waited for the whole six days to do the business down the mountain. So to answer the question. I belive that food plays a role. The mc ate only soup or porridge that is less in msg or protein. That helps a lot i think, cuz on the mountain, we ate tasteless food (even uncooked rice) but so far, our stomach was a okay.
How the fuck he is not constipated