First off side stories are r19
ML follows MC around and even reverses their contract so he's the slave and MC is the master. ML also lies that they slept together and they were in love with each other (not a lie, but did exaggerate). MC finds all of this hard to believe but thinks ML is so kind/gentle (Lol) Eventually he starts working at the guild again, and reenters a dungeon with ML/crew. That's where he reunites with bundles who cries clinging to him and is sad that only ML remembers him, so bundles gives MC his memories back through a memory orb that MC had in the first timeline. MC getd his memory back tells ML he has no shame pretending he's a green flag when he's a red flag. ML and MC reunite with intimate moment (not all the way but get each other off). MC immediately wants to prevent the ML's mother figure's death so they go meet her. ML eventually uses MC's memory orb to return all of the friends memories (because MC was sad about it) and they rewrite the future so no one dies and make bundles into a celebrity. MC/ML also do the deed at some point. There is one more side story where ML has amnesia and it takes place a few years after, showing everyone living happily (well aside from thr amnesia)
If you want continued spoilers of the side story