You lift up the boxer shorts, they're a cotton mix and have a blue check pattern on them, not bad but they look and feel a bit used. You sniff the crotch experimentally and sure enough get a whiff of sweat, ass and what is definitely cum. Pulling your head back you feel a slight tingle in your cock, something definitely appeals to you so shrugging, you step into the boxers and pull them up over your ass.
They are way to big for you! You have always been skinny, definitely a twink in the club circles and these boxers are meant for someone with a lot more bulk than you. But any port will do in a storm, at least your not buck naked now.
Holding up the boxers with one hand you look around the cube but still see no other distinguishing features and certainly no way out. Turning round you realise that the alcove you lifted the boxers from has gone and in fact you can't even tell for certain which wall the damn thing had been in! Reeling slightly you sit back down on the floor, disorientated and now just a little frightened. After all someone must be controlling this place otherwise where did the boxers come from? Whilst you sit pondering your situation the boxers are now in close contact with your ass and the sweat and dirt of the fabric is slowly working its way deep into your crack, warmed by the heat of the floor your junk begins to sweat and you reach down to scratch your balls as a bead of sweat runs down them. As soon as the cum stained fabric touches your sweaty balls the stiffness leaves the underwear and the deposits enter the pores of your skin seeking out the small testes in that sac and beginning to work on changing them.
You continue to scratch at your junk actually glad that your wearing loose boxers instead of your usual tight briefs. In fact you start to wonder why you ever bothered wearing briefs, boxers are way more comfortable.