Mildly curious about the device he didn't order, Brian pulls the manual out of the box and flips through it. He scoffs a bit at the bits he reads. It's all absurd, but he sets the manual down, picks up the remote, and points it at his cock, pressing the “+” button. He starts to laugh at nothing happening, but the laugh dies in his throat as he feels his cock growing, until he pants are stretched over a bulge like he's never imagined before.
A soft “Oh hell no,” escapes his lips as he almost leaps to his feet and runs to his room, pausing as his thighs squeeze at his testicles, making him gasp and adjusting his walk. Brian slams his bedroom door behind him and he has his fly and pants open before he gets to his bed, pulling them down his thighs. He boggles at the sight of his new cock and balls. Still soft, his cock is four inches long, over half what his previous erect size was, and his balls are the size of tangerines.
Brian is frozen for a moment, finally spitting out,“Fucking hell. I have to try this out,” as he brings his hands to his groin. His eyes go wide. His cock feels even better than before, that plus button must have made it more sexually sensitive too! “Damn! That thing is amazing!” With that, Brian feverishly starts stroking his cock, bringing it to it's new nine-inch length and blowing his load in scant minutes, the orgasm he's hit by lasting for several minutes as he pumps several cupfulls of cum across his bedroom floor and against the wall across from him.
After his orgasm ends, Brian lays back on his bed, recuperating from the new, more intense orgasms his enhanced cock has given him. Finally he grins, sitting up. “I have to see what else that thing can do!” He restores his underwear and pants into their proper position then frowns at the cum he's sprayed over his room. He takes a slightly guilty step towards the door, telling himself, “I...'ll take care of that later.”
With that, walks to where he left the remote and picks it up again, a foolish grin plastered on his face, deciding what to do with the strange device.