Kurt went back downstairs and settled in to watch some television. Finn didn't say anything, just smiled as he sat down opposite Kurt on the couch. Kurt knew he couldn't see the diaper under his clothes, but Finn knew he was wearing it. Kurt's face was a dead giveaway.
Kurt tried to keep an eye on him, hoping that Finn will look off in some random direction one too many times and expose his hiding place to him. It was getting difficult to spy on him without giving himself away. Kurt can feel himself getting more and more desperate, and he was having a hard time sitting still. His legs were crossed tight and his knees were bouncing on their own.
"Kurt, why are you doing this to yourself?" Finn asked. "You're wearing it, right? Just let go. That's the point of the whole thing. You gotta stop torturing yourself."
"No. If you won't tell me where the key is, I'll find it for myself. I've lived with you long enough to know you have a 'tell', everyone does," Kurt countered. "I figure it out, get the key, and we can be done with your little trip to Insanity-ville. And we will never speak of this again."
Eventually the cartoons they were watching ended, and another show came on. Kurt still hadn't figured out where the key was, and he was running out of time. Very quickly.
"Finn, please tell me where the key is." He was not too proud to beg. "Don't make me do this." He could feel tears in his eyes, and he wasn't sure if they were from the physical pain of holding on, or from the humiliation of feeling his dick start to leak.
"Just let go, Kurt. It's for your own good. You'll feel better afterwords. I'll even change you afterwords, so you don't have to deal with it," Finn offered. "Relax."
"No." He whimpered.
A few more minutes went by, and he could no longer make out Bugs Bunny on the television through his tears. He moved both hands to wipe his eyes and cover his face. He curled up on his end of the couch and tried to wish himself anywhere else.
In doing so, he took his eyes off of his step-brother, who seized his moment of opportunity to strike.
One minute, he was on the other side of the couch. The next, he was dragging Kurt over to him while tickling his sides. Kurt tried to fight him off, but the shock was too much. Kurt buried his face in his hands and cried into Finn's chest as he finally gave in and let go.
Kurt didn't register being picked up until he was lying down on a towel laid out on Finn's bed. It took him a minute to realize what was going on, to notice what else was on the bed. Finn had obviously planned this ahead of time, because near his head was a small stack of clean diapers and some baby wipes, a bottle of baby powder, and a small plush black and white rabbit, with the tags still attached to one floppy ear. Kurt saw it, and his heart sank. He remembered that rabbit. Finn brought it with him to school in his backpack, intent on giving it to Quinn for the baby. The same day Rachel told him the baby wasn't his.
Kurt couldn't bring himself to make eye contact with Finn as he changed him out of the wet diaper, cleaning him up with the baby wipes. Kurt let him do it without a fight. He felt completely worn out, and emotionally drained. He said nothing as Finn powdered his skin, fastened him into a new diaper and pulled sweats back up. He disappeared for a minute to throw the mess away, before he came back and settled next to Kurt on the bed.
Finn tugged Kurt in close, whispering encouragements in his ear, and Kurt moved up onto his chest, not bothering to hide the fact that he had his thumb in his mouth. It was a nervous habit that he never really grew out of. Not even his dad knew he still did it and he hid it well from everyone. Given that he had just wet a diaper like an infant and Finn had changed it, embarrassment from being seen sucking his thumb was the least of his worries. He didn't care. It calmed him down and made him feel a little better. For once, he felt somewhat safe with someone other than his dad holding him. It didn't take long for him to fall asleep like that, curled up in Finn's arms.