I can...

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Mine get so tight, I can feel it in my throat

Yes i can put them inside, but i didnt it for some years
.

Mine go hiding and I have to push them down.

When playing with my ass hole or getting fucked my balls retract

like this?

Cock or ball rings would help keep them from drawing up if that is what you want.

Mine frequently slide up inside and makes my cock look much bigger

Mine hide when I get fucked roughly

In this Situation my Balls completly inside Top feeling . THX Lady [deleted image]

Yeah I can. Push them up inside.

On very few occasions when I've cum very hard
my balls retract tight against my body and after a few
seconds it feels uncomfortable... it depends on how
intense my orgasm gets at that moment.

And, of course, during the cold weather seasons I'm still
going commando in my shorts or jeans; therefore my package
tends to shrink a bit in efforts to stay warm.

But, no, I can't retract my balls inside me.

Would be nice if it were comfortable, and also if men
could do it at will... that would serve as added
protection for our balls during a physical fight.

When getting fucked hard my balls dissappear, only my little cock is seen

my scrotum is quite tight and when my penis is erect it pulls my testicles right up it can feel uncomfortable during sex or masterbation and have to stretch them out once in a while...but i cant make my testicles go up inside no.

It does happen to me.
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yeah i can well mmm dunno if u mean like all the way inside but i can move them in and out XD

I don't knwo abot "make" but mine sometimes get forced up during sports or sex and I have always hated the feeling. I can push them up quite easily but don't enjoy the sensation.