The story is stirring my little clitty in its cage, but it went back to the training camp story half way through. Can you edit it and continue...
The Egg device has holes underneath for drainage, but you still have a LOT of drips (need a pad). It is available from Aliexpress in plastic or...
Almost always being in panties, I have had problems keeping the pee hole of my cage on the panty liner (tried various sizes). Went to period pads,...
For non-sissy locked boys, Male specific incontinence pads (triangular) fit nicely in briefs and solve the leak, drip and odour problems.
Try aliexpress. There is a large range and no trouble with the search. Search "cock cage".
I've seen another version of the ending. Marla has her own belt which she wears occasionally to enjoy her own sexual frustration. Harry gets hold...