Chapter 8 Gargantuan Gallus

Gallus looked around the gym nervously. Typically the Ponyville fitness center was a relatively comfortable place for Gallus. However, Between his constant sweating and giant boobs he couldn't be more uncomfortable if he tried. Because it was a gym and a hot day just about everypony there was wearing as close to nothing as socially acceptable. No matter who Gallus looked at he couldn't help but be somewhat aroused at the sight of them in sweaty skimpy clothes. It didn't help that Gallus's 'arousal' felt so bizarre that he couldn't really process what was going on inside his panties.

“Why did I even come here?” He muttered under his breath before sighing. “Doesn't matter, I'm here now and I might as well make the most of it. Maybe I should hit the treadmill.” Most of the treadmills were occupied but eventually Gallus found an empty treadmill at the back of the gym. With a grin he hopped up on the treadmill and started it up. However no more than three seconds after he started seriously running he had to stop because of his boobs bouncing around everywhere.

“Crud! I forgot the bra doesn't stop all the bouncing.” He paused. “Maybe an exercise bike will be easier to use.” Gallus quickly hopped off the treadmill and headed towards the exercise bikes.

“Hey there.” Gallus stopped dead at the sound of a familiar voice. He turned to see none other than Silverstream's brother Terramar standing behind him.

“Umm.” Hi...” Gallus trailed off.

“I'm sorry. I thought you were someone else.”

“It's ok.” Gallus nervously chuckled. “I get that a lot.”

“I'm Terramar by the way.” Terramar grinned. “What's your name?”

“I'm Gall...” Gallus bit his tongue. “Gally.” He nodded. “My name is Gally.”

“Gally huh? Are you by chance related to Gallus? I swear you look just like him.”

“Umm err yeaaah.” Gallus nervously nodded. “I'm his... sis...ter?”

“Oh... ok.” Terramar rubbed the back of his head.

An uncomfortable silence descended upon them. The only clothes that Terramar wore were a pair of jet black gym shorts with a white stripe on them. Gallus felt his vagina sweat even more as he looked over Terramar's well toned abdomen and decent pecs. He tried taking his eyes off of Terramar's torso, but that didn't help as his wandering eyes fell on the huge bulge in Terramar's gym shorts. Gallus had to crane his neck up to look Terramar in the eyes because of how tall he was. He quickly regretted looking up at Terramar's face as he realized that Terramar was practically drooling over his cleavage.

“You're staring at my cleavage.” Gallus frowned.

“Oh.” Terramar blushed and looked elsewhere. “I'm sorry it's just that... I never figured Gallus's sister would look so attractive.”

Gallus blushed. “It's fine... sooooo” Gallus trailed off. “What brings you to Ponyville?”

“Oh, the cutie mark crusaders invited me over to visit. I just got done seeing their clubhouse, so I figured I would stop by the gym to work out a bit before seeing my sister. What about you?”

“Umm.” Gallus shuddered. “I'm here to visit my brother, but I can't find him anywhere.”

“Oh”, Terramar grinned. “Maybe I can help you find him?”

Gallus blushed as he realized the bulge in Terramar's pants was getting bigger by the moment. “Um no thanks I'll be fine... in fact I gotta go see you later.” Gallus barely waited to hear Terramar's response before bolting back to the locker room. Once inside he quickly stripped off his clothes and ran into the shower. Once under the water he sighed.

“Holy buck that was tense. The way he was leering at me, and those abs just.” Gallus blushed as he started wiping the sweat from his body. “Was my sweat always so oily?” Gallus continued his shower for several minutes before groaning. “How does Silver put up with that guy? Thank Celestia I don't have a sibling to deal with.” The more Gallus cleaned his body the more he started smelling a weird aroma permeating the air. “And what the buck is that smell? Do all girls smell like that?”

“Actually it's likely just you that smells like that. Not that it's an unpleasant smell.” Gallus's eyes went wide at the sight of Terramar standing next to him in the shower room. Terramar's gym shorts were long gone leaving him butt naked with his fully erect horse cock throbbing with need.

“Terramar? What are you doing here? 

“Better question, what are you doing here? This is the men's locker room.”

“Ummm.” Gallus looked around nervously. “It was a mistake?” Gallus grinned.

“You can drop the act Gallus I know it's you.”

Gallus's mind paused. “But... how?”

“You just said so a few seconds ago.” Terramar grimaced.

Gallus thought back over what he had said earlier. “Oh.”

“You know Gallus.” Terramar smirked. “You make for a pretty hot girl, and I can't help but notice the way you look at me every time we see eachother. I've never really been into guys but now.” Terramar got super close to Gallus and whispered in his ear. “Now that you're the most buxom lady, I've ever seen I'm very interested.”

Gallus felt his heart beat pick up and even more arousal bombard his mind. Several moments passed before Gallus seized Terramar's head and roped him into a lust addled kiss. Terramar was quick to reciprocate Gallus's affection. Gallus explored Terramar's mouth in all it's splendor before breaking from the kiss as spit trailed from both their beaks.
“Those breasts are amazing Gallus. Can I feel them?”
Gallus smirked seductively. “You can touch me so long as I can touch you.”

Terramar wasted little time and started gently squeezing at his tits. Gallus had experimented with his breasts before but having somepony else caress his giant knockers was way different than doing it on your own. As Gallus felt his nipples harden and his arousal mount he looked down at Terramar's cream white horse junk. Gallus used one of his talons to stroke Terramar's penis while the other focused on his balls. 

“Geez Gallus that feels good.” Terramar moaned somewhat. “How did you get so good?”

“Being bi has its benefits big boy.”Gallus stifled a moan as he felt himself reach his first climax. Fortunately, for him he knew there were plenty of orgasms yet to come. Eventually, Gallus broke away from Terramar's fondling.

“What's up?”

“Oh nothing.” Gallus giggled and gave a gentle stroke to Terramar's penis. “Just wanna give your tool some more 'intimate' attention.” Without much of a word Gallus started to lick and lap at Terramar's erect penis as if it were a lollipop. Once he had thoroughly covered Terramar's penis in saliva, he focused his attention on his leathery balls. After several minutes of Gallus's perfect touch he felt Terramar's penis start to throb in his grip, prompting Gallus to stop.

“What's up?” Terramar frowned.

Gallus swiftly got on his hands and knees and raised his ass up into the air. “You're close Terra, and I don't want you to waste that boner of yours.”

Terramar smirked as he smacked Gallus's ass. "Sounds good to me." Within moments Gallus felt a surge of alien pleasure shoot through his spine once Terramar hilted him. Terramar took firm grasp of Gallus's ass and went to work pumping his penis in and out of his gryphon pussy like a wild animal. Gallus had been fucked in the ass before but somehow being fucked in this new hole felt so much smother. Part of him preferred the ass but the pleasure he was feeling nullified any complaints he had. A few moments of pounding later Terramar slowed down somewhat and became more forceful with his thrusts. Gallus's tongue lulled out of his beak as he felt Terramar shoot ropes of steaming hot cum all over his body.

“Wow.. that was.” Gallus started but stopped when he realized a familiar sensation had returned. In a panic he glanced down at his chest and saw his breasts once again starting to expand. “What the!” Gallus cried as he stood up to get a more thorough look at his breasts. Unlike the first time the expansion happened to him, the oscillation of his chest happened once every few seconds as opposed to every few minutes. “Umm Terramar.” Gallus faced him. “I think.” Gallus stopped dead as he looked over Terramar. His body was shifting much like his had a few weeks ago, Smaller frame, a shrinking penis and a fairly decently sized pair of boobs sprouted on his chest.

“Hey Gallus.” Terramar gave one of his growing tits a squeeze. “Is this how you changed? Because this feels amazing.” Gallus tried to pay attention to Terramar but all he could focus on was his own chest. In the space of a minute, his breasts had nearly doubled in size, and they showed no signs of stopping. A loud squelch drew Gallus's attention back to Terramar who had completed his transformation into a buxom hippogryph woman. Gallus experienced a considerable strain on his back once he realized his breasts had grown so large his nipples dangled above his knees. 

Once his bust expanded several more inches Gallus, fell forward, landing on his new massive boobs. Despite being so large he couldn't stand up they continued expanding. Eventually, they got so large that they started to lift his paws off the ground. Once Gallus's boobs were so big, he was resting on them as if they were beanbag chairs the sensation stopped. He tried in vain to get back on his feet but his efforts only lead to him jiggling around on his breasts.

“Wow Gallus, that's pretty big.” Gallus peered over his giant boobs and saw Terramar sitting on the shower room floor fondling his own breasts and pussy. He pushed down into his own breasts in a vain attempt to stand again, but all he did was send a jolt of sexual pleasure through his body. Several minutes passed before a group of three nude stallions entered the shower room. All three of them stopped in their tracks at the sight of Terramar's fondling and Gallus's struggle. Almost instantly all three of their penises hardened.

“Hey boys.” Terramar made his way over to one of the stallions. “I'm feeling a little horny care to help me deal with that?” The stallion in question wasted no time in making out with Terramar. Meanwhile the other two stallions approached Gallus and started prodding at his gigantic bust.

“She's so big. I never imagined something like this was possible.” Gallus moaned at the stimulation he was receiving from their fondling. Out of the blue Gallus felt one of the stallions get up behind him and start fucking his pussy again. Several minutes later Gallus groaned as he felt the stallion on his back nut inside him. Once the high of the mutual orgasm wore off, he stared wide eyed at the stallion that had stayed behind to fondle his giant tits. Where once stood a stallion now stood a mare just as busty as he ever. A few seconds later a second mare came into focus. Without much hesitation she started jerking herself off followed by the second stallion. Gallus glanced over at Terramar and the first stallion. However, there wasn't a first stallion there only a third mare licking Terramar's pussy. Gallus turned his attention back to the first two mares who had started kissing eachother.

“Hey, you girls wanna give me some attention?” Gallus smirked.

One of them giggled. “Gladly.” One of the mares went behind him again and started lapping at his sopping wet cunt. As the day marched on more and more stallions came into the locker room after working out. These stallions quickly found themselves transformed into mares and joining the huge lesbian orgy in the men's locker room...