He is gorgeous!

A high temperature can be normal after surgery. Just keep an eye on him for a day or so.

The wee'ing on the bed is probably because he feels a bit off colour. It is possible that he has a urine infection after the op as they are in similar areas so a possibility. How far is the litter tray from your sons room?? It maybe worth popping one in the room for a few nights whilst he recovers so he doesn't have to go so far....

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Lollo

If you are sure he isn't ill, I would think it is probably just stress from the op and stress from your other cat's behaviour towards him when he came back from the op.

If worried, anxious, upset, feeling weird, unsettled, territorial, in fact any emotion at all, cats will pee.
Having multiple cats increases the chance of inappropriately peeing.
I may be wrong but IME, I feel Bengals are far more prone to this than other cats.

http://www.a-house-full-of-cats.com/catpee.html

It usually took my male cats around a week to get back to anything classed as normal for them. it's a big op having your balls snipped off (i shouldn't laugh at that but i do lol).

Peeing on beds and anywhere outside of the litter tray, is a dominance thing 'this is mine'. So he could have done it out of being a tad annoyed or because his bladder system may not be up to full strength. Keep an eye on him though.

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Lollo

I usually had all my boys 'hate' me for a good week lol mind you, i don't blame them, chopping off their manhood

He seems a bit brighter this afternoon & since it got darker he's been running along the windowsill jumping up & down trying to get to a bat that's flying about outside.
Definitely much better, OH just arrived home & Tino got to the door before the dog lol
I'm still keeping an eye on him though & keeping Abe's bedroom door closed to be on the safe side