Hheellpppp

If you're asking about the last few panel, after his parents death his legal guardian sexually assaulted him while he was a minor. The bottom trusted the Guardian with the kid since he was a cop but he also disowned the top as soon as he turned 'big and old' because he was a fucking pedophile and the top didn't suit his fetish anymore

I still don't get the bottom and top part

Bottom is the unc and top is the boxer