Katie giggled as she was spun around and gently pushed onto her back by her boyfriend of 5 months, Stephen. Before she could get up he had already climbed on top of her and placed most of his weight on her torso while he grabbed her by the wrists and pinned to the bed. He leaned in close, his warm breath tickling her ear as he tauntingly whispered, “I told you I’d spoil you tonight.”

Katie felt goosebumps as Stephen pulled his head away from the side of her face and locked eyes with her. His eyes were steely and admittedly a bit intimidating but his soft, gentle smile said otherwise. He raised Katie's arms up above her head and crossed them so he could pin both of her arms by the wrist with one hand. And now with one hand free he grabbed the bottom of her shirt and lifted it up to her neck, exposing her lacey, olive green bra. Stephen leaned on closer to Katie, nearly laying completely on top of her as he snaked his hand behind her back and, after a few seconds of finagling about, managed to undo her bras clasp. She could feel Stephens' eyes committing her small, B-cup breasts to memory as they rose and fell on her chest with each excited breath she took. 

“God, you are so fucking cute.”

Katie's face blushed as she turned her head so she wasn’t looking at Stephen. “D-don’t say that! You know how I feel about my chest…”

“I think they’re perfect and cute!”

“Well…” Katie pouted, “I wish they were bigger. At least double D-cups.”

“Hmm… That’s not what I heard.” Stephen looked down at his embarrassed girlfriend and couldn’t help but chuckle. “I could’ve sworn you said ‘If they fit in a Z-cup bra then they aren’t big enough’ but I could be mistaken.”

“Wha- Why would I- I never said- That’s ridiculous!”

“Darling, it's fine.” Stephen chuckled. “You left the forum up when you let me borrow your phone to make tonight's reservations.”

Katie stared up at her boyfriend, dumbfounded and at a loss for words. Her cheeks burned with the worst embarrassment she had ever felt and to make matters worse she was currently pinned to her bed, unable to move if she wanted to. “What does that matter anyways?” She pouted. “It’s just a dumb fetish fantasy.”

“What if it doesn’t have to be ‘just a fantasy’? And I don’t think it's dumb either.”

“I’m not really into roleplay Stephen. I just-”

“I wasn't talking about roleplay. Do you trust me Katie?”

Katie hesitated as she stared up at Stephen, unsure of what to make of what he was getting at. “Of course I trust you.”

“Now I need you to promise to keep what happens next between me and you. You understand?”

“Yeah, sure I just- What do you mean?”

“You’ll see.” Stephen let go of Katie's arms, unzipped his pants, and fished his dick out of his boxers which he let land on Katie's chest. Then he gently placed his hands palm down over her B-cup breasts and waited.

“What are you doing? I-” She was startled by Stephen's hands suddenly glowing a vibrant, pulsing purple. She expected him to make some sort of witty remark or comment but when she looked up at him he looked serious as could be, deep in concentration. His hands began pulsing once again, this time causing the unnatural glow to flicker to and fro and after a short moment of keeping that rhythm the glowing had spread to her tiny bosom. His hands would glow and as soon as the light faded away her breasts would too glow and tingle as whatever he was doing was passed along inside her. “Nnn~ What are you doing babe? This feels… weird…” But she received no answer. Her eyes wandered back down to his hands and after watching a few cycles of the alternating light show she noticed that her boyfriend's hands were rising with each pulse sent into her chest. “Wait. Are they getting bigger!?”

“They are, but I need to concentrate or else they’ll-” Stephen's hands broke the cyclical rhythm he had been holding, causing his hands to glow more and more purple and with nowhere else to release the pent up energy it was sent straight into Katie’s chest. “- that will happen…”

Katie felt a surge of sensations flow into her chest as they expanded from the meager C-cups they had become to two wobbly yet perky beach balls. The sudden growth pushed Stephens hands upward as the sudden mass of titty flesh spilled through his fingers and Katie's now coaster sized areolas and bottle cap sized nipples pressed into the palm of his hands. “Oh mah gaw!~” Katie screeched in ecstasy as her back arched of its own volition.

“Are you okay darling?” Stephen asked as he tried to lift his hands from his girlfriend's pillowy chest but her hands clasped down onto his as she forced him to press deep into her breasts.

“More~ I want them bigger~”

“Bigger!? Katie, I don’t think they make bras this big. I can’t make them any bigger.”

“Aww… if I make you feel good will you make them bigger?~” Katie cooed as she grabbed a nearby bottle of lube and coated her tits in it.

“I don’t see how that changes- anything!~” Stephen shuddered as Katie grabbed the side of her breasts and squeezed them together, squishing Stephen's cock which was nestled between her boobs, and began vigorously shaking them up and down his shaft. “Katie…~”

Katie looked up at Stephen with a crazed, lust filled grin as she worked her titjob magic on her wizards staff. “Imagine how good this would feel if they were bigger~”

“Fuck~ They’d crush your ribs…~”

“I’ll let you fuck my ass~”

Stephen thought for a moment as Katie continued to assault his dick with her love pillows. “... Fine!~ But only after.”

“Deal!~”

Stephen got off of Katie as she rolled over to her stomach, which caused the top of her breasts to squish and reach her chin while the rest of her tits spilled past the sides of her torso . Meanwhile Stephen grabbed the bottle of lube and hastily prepared her back entrance.

“Ready?” Stephen panted.

“Mmm hmm~” Katie nodded her head.

Stephen positioned his rock hard cock between Katie's cheeks and invaded her rear entrance, eliciting a soft and sensual gasp from her lips. He started off slow but quickly lost himself in the moment as each thrust became harder than the last. Katie squealed, moaned, and gasped each time his waist slapped against her fat ass and he couldn’t help but feel an intense love for this woman. “Fuck it~” Stephen placed both hands on the backside of Katies breasts and pressed down. “How big do you want them?”

“You- ah!~ know how- fuck~ big!~”

He did in fact know how big she wanted them as the various crudely done photoshops of preposterously and plainly insanely large tits from that forum filled his mind. His hands glowed purple, shading everything in the room a deep magenta hue as he welled up more and more energy within him. “Here you go babe!~” With one last thrust he couldn't keep it in anymore as his dick twitched and spasmed releasing his seed deep into his girlfriend's intestines. Meanwhile, with his concentration broken, the sheer well of energy he had stored up was finally released into Katie’s breasts which suddenly surged in size as they launched themselves free from underneath her and spilled from both sides of the bed and touched the ground. “Hah- hah- hah- That big enough for you?”

“God, yes!~ Oh my god yes!~” Katies entire body twitched and spasmed as the bedsheets beneath her became soaked in the various juices her convulsing pussy squirted out as her hands pawed away at the expanse of titty flesh she had always thought impossible. Obviously Stephen couldn't leave them at this size but he figured he’d let her enjoy them for as long as she could.