"Well," Runt said. "A deal is a deal. You can have it back now."
I was only barely paying attention. I was still sucking on my own cock, enjoying the feeling of both giving and receiving a blowjob. Suddenly, though, it started shrinking in my mouth. I moaned a little and kept sucking, trying to get the last bits of come in my mouth before my dick disappeared completely.
"Mmm, you're pretty good for an amateur!" Runt said. He was rubbing the back of my head approvingly.
Runt's dick that had once been mine had shrunken down to about an inch and a half at this point. I gave it one last suck before it disappeared completely from his crotch and leaned back, licking the remaining cum from my lips. His other - original - dick looked larger than before. Quite a bit larger, actually.
"Why was I so enthusiastic about that?" I asked, slightly coming back to myself. I can't believe I sucked him off! And I definitely had enjoyed it, though it was slowly becoming harder to imagine liking the feeling of a dick in my mouth.
"I have that effect on people." Runt smirked and looked pointedly at my dick.
Oh, right. I have my dick back. How did I forget about that part of the deal? I sucked him off, and now I have my... manhood...
"What the fuck?!" I yelled angrily at Runt. My dick was about 1.5 inches long, and hard as steel from being in proximity to him. My balls were back too, but they, oddly enough, seemed larger than they were originally. I could sense their heft. My package felt off-center, like the weight was in the wrong place.
"Oh, I thought I'd keep a little bit. You know, a memento." Runt was grinning devilishly.
"Come on, dude, I blew you for my cock back. My old, seven-inch cock. Can't I get the rest of it, too?"
"I don't hear any complaints about your balls!"
"Trade ya?" I didn't mind the larger set, but I'd trade down in ball size to get my dick to its former glory.
Runt laughed. "It's never so simple. Don't you know that by now?"
"I'll... suck you off again?" It didn't sound quite as appealing as it probably felt five minutes ago, but I figured that would come back to me.
"You're getting warmer..." He swished his hips the slightest bit so that his recently-improved pendulous dick gave a hefty swing, as if to give me a clue.
"You...Fuck...Me?" My eyes widened in horror, taking in the monstrous size of the cock before me. With the extra five and a half inches Runt had stolen from me, it was now well beyond porn star proportions. A rod like that could split me in half. How bad did I want my dick back? I looked down at the tiny thing. Did I really want to live with less than half of my natural size for the rest of my life?
"I could, of course, find someone else more willing..."
"No!" The thought of Runt giving someone else my dick length was all the motivation I needed. "Please... I'll do it."
"Do what?" The impish grin was back.
"You can fuck me."
"Great! I'm so glad we have an understanding," Runt said, rubbing his hands together.
I slowly, reluctantly turned around, got on all fours. I just wanted my old, familiar meat swinging between my legs again.
"Oh, I didn't mean now," Runt said, as he saw what I was doing. "I'm far too spent to do anything so soon."
"But you said..." I was confused and panicking again. I could see Runt's face split into a wicked grin.
"And I'll keep my end of the bargain. When I'm ready and in the mood. For the time being, you can rest assured I know I can trust you to be a good host to me while I'm lying low - this is all the collateral I need." He gestured to his cock, made enormous by my five and a half inches. "For now though, I'm tired and I need a rest. Catch you later!"
Runt gave me a salute and, suddenly, wasn't there, leaving me on my knees, with painfully erect microdick between my legs.