When I was a little kid, I had this toy box covered in baseball cards. Like shellacked to the outside as the finish on the toy box itself. It was a really cool little boy kind of thing my dad made me. Anyway, when I was twelve, I start nutting in my sleep all the time. I don't want anyone to know this, so I start putting the jizz filled grunds in the toy box. Later I started jerking off into socks and putting them in there after I was done. One day I'm sitting there trading baseball cards with my friend and my mom goes into the closet looking for something. I have no idea why she opened that box full of discarded jizz garments, but she did, and just completely flipped out while the other kid was there. At first I don't think she could figure out what all that shit was, then when she did she just acted all disgusted and disappointed and heart broken and was pulling all those dusty, crusty jizz rags out of the closet and chastising me in front of my friend. I honestly nearly died from embarrassment.
I hope this story helps someone or can relate. Since I have cum to understand my body.
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I used an empty jar that marinated artichoke hearts come in and kept it out of sight in my nightstand. I would rinse it out regularly so there was little chance of a dirty jar being discovered. If it had been, I was never the wiser.
I used to sneak a washcloth from the linen closet and use it for a few times around then toss it in the hamper and grab another one. No one ever found them or knew. I'm sure most guys had/have some method for discretely getting rid of the evidence