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Fun fact, the author drew this mostly for the smut hence the large amount of sex scenes, but the most recent chapter has a bit of lore.

First, Leon has escaped! But Nergal is an obsessive jerk who wants Leon back. And his escape was mostly blamed at Beryl (beast man) for allowing himself to be tricked, so Beryl has to find Leon or he will be demoted to the bottom of the hierarchy. Mephisto got the same warning by Nergal, but I don't think he cares that much about it.

Second, Mephisto (tentacle man) let Leon find a way to escape. Mephisto said it to Nergal, that he has a plan that will bring back life to their dimension that involves a runaway Leon. HOWEVER, Mephisto seems to have larger plans. Mephisto hates Leon, and I think that Mephisto has realized that Nergal is more focused on Leon as an individual than as a tool for reviving their world. So Mephisto may be planning to get Leon in a position where Leon will not be defended by anyone or he might experiment on Leon where Nergal can't interfere. I think this because Mephisto started to manipulate Beryl by telling Beryl that Leon doesn't care about him. Leon used Beryl and abandoned him, but at first Beryl didn't believe that Leon would do that to him - and Mephisto used that insecurity to manipulate Beryl (who is going to be looking for Leon).