"Woah!" Martin said.
"Wow!" Jeff chimed in.
"I agree, stunning!" Loius clapped, "I think we can all agree, Joe is the winner! He's the smartest of us all!"
Joe stood there, rocking the new massive mammaries on his chest back and forth. He'd even surprised himself with how big they were. Sure, the spell that had given them to him had been called "Boobs to Brains" and sure he'd seen the other guys try it on themselves as part of their stupid 'let's use this spell to find out who's really smartest!' contest, but now that he'd done it to himself, he didn't feel any dumber.
"Like, what even is intelligencualism anyways?" Joe asked, feeling philosophical. Something wasn't right about what he'd just said, but it didn't seem important. "Whatever it is, I have the most!" He bounced his massive tits.
"Well, you did darling." Martin smirked, "Now you've got the most boobs. At least until the spell runs out."
"But I already would've had the most boobs!" Joe whined, "You all already turned back!"
"She's got us there." Jeff chortled. "Some of those smarts must not have fit into those boobs!"
Joe smiled. She liked being smart- "Hey, wait a second! I'm not a she!"
"Yes you are deary." Louis nodded, "That bikini wouldn't hide even the smallest of dicks."
"No, I mean- You guys!" Joe snorted in frustration, "We didn't call any of you 'she' when we cast the spell on your dumb-dumb brains and you only had tiny titties!"
"Mine weren't that small." Martin said bashfully. It was true, he'd been pretty busty, but nothing compared to Joe.
"Oh? You want to go back and compare Martin?" Jeff sneered. He was still more than a little offended when he'd cast the spell, he'd had tits he could barely grab.
"No, no!" Martin answered hastily. "I like my cock."
"Mmm. Cock." Joe muttered.
"What?!" Jeff's attention snapped to Joe.
"What?!" Martin did likewise.
"WHAT?!" Louis had heard it more clearly.
"What?" Joe asked and spun about to look over his shoulder, sure they were looking at something behind him.
"...did the spell make Joe a bimbo?" Loius asked.
"It didn't do that to me!" Jeff shouted.
"It barely did anything to you, dumb-dumb brains." Louis smirked. The spell had made Louis only moderately endowed woman, but that was still a lot more than Jeff had had.
"I- well..." Martin blushed a little, "We all masturbated like that though, right?" Martin certainly had. And when he had... well some thoughts of not women had crossed his mind.
Jeff and Louis grumbled along and admitted that yeah - they'd played with themselves too.
"Oooo, that sounds fun!" Joe laughed. "But I think a cock would feel better."
"WHAT?!" The three guys shouted in unison.
"Yeah." Joe nodded, "Martin's runner-up, so he gets a prize. Martin, you wanna..." Joe pointed to the bedroom.
"You- you wanna have sex- with a guy?" Martin stammered. The other roommates were dumbstruck.
"Well of course!" Joe giggled, "I bet it's going to feel soooo good!"
"But... you're not gay... so... why?"
"Because I'm the smart one you dummies!" Joe stuck out his tongue. "Coming Martin?"
Later, when Jeff and Louis heard the sounds coming out of Joe's bedroom, they couldn't help wonder if Joe was right, and really was the smart one!
Martin would think the same in retrospect, but he was a little busy making Joe emit those sounds of carnal bliss.