does your cock shrink when cucked

hi i love this site and even though i am not cucked i like to cuk my self by finding buys to fuck my shy wife .
the thing is i am more than enough for ( i think ) i have 8 inch and always make her cum she is very tight and normally even when soft i am quite big.
My question is that when i am on this site and think about her being more dom my cock shrinks till it is very small and drips precum constantly. and i find it difficult to get hard even though i am very horny, does any one else have this happen?
I would also love her to make me wear her dirty panties and cage me.
What would be the most discreet cage for work attire ( shorts) and for an 8 inch cock?

You will not fit well in any of them but the curve. The curve is obvious under clothes. You will need a custom unit. Trust me. The cb-6000 fits the best but cannot be worn long term if you are big like me. Skin is in constant contact with plastic and gets sore and smelly fast.