He's interrupted by the doorbell.

Adam was a bit shocked, since it was the middle of the day and no one was normally home. He reluctantly let go of his throbbing cock and peak through the curtain of his room.

Looking down on the front door, Adam saw Devon and Clark nervously waiting for a response. He had known Clark lived nearby, but had never guessed that the boy knew his exact house. They had obviously followed him as quickly as they could. Remembering the shower, and imagining what they wanted, had Adam's cock straining to burst.