Sizable Offering

Max stared at those now fuller tits and enjoyed one thing in particular about them.
"C-could you make them full? Like... really full to the brim?" he asked, and Sherrie smiled warmly in response. She concentrated for a moment, and suddenly her tits begun to fill up further and further, growing bigger and fuller with every passing moment, till there were almost spherical with all the milk stretching them. Max couldn't help but grow a boner under the sheets.
"You like them bigger, don't you?" Sherrie eventually concluded, and Max felt like he was caught.
"Y-yes." he stammered.
"Is that like your kink?" Sherrie wondered, but then suddenly got reminded of the predicament he had been in earlier. "Oh wait, this is why you made your dick so hard and huge right?" Max could feel his cheeks flushing instantly, he could only nod in response.
"Ah sweetie, don't worry, that's totally fine with me." Sherrie laughed with a friendly tone. "Everyone has the things they like, and you happen to like those things big." She gently stroke his hair for a moment, till he had calmed down again a little. "Just.. so I know: what is like the size you would prefer them?" Instantly Max felt uneasy again, but also compelled to answer.
"I... kinda... like them bigger." he tried to explain.
"You already said that." Sherrie reminded him, still warmly smiling and stroking his head.
"I mean... there is no size too big for me." he explained and felt how his face was turning bright red in response. "I mean I know you can't just walk around like that in public, but if no one else is watching..."
"So you'd be walking around with a giant cock in the house as well if you could, too?" she nailed it. Max felt his dick raging and his eyes getting fixated on those huge orbs her mom sported now, that she - not by accident - kept slowly swaying right in front of his eyes.
"Y-yes..." his voice was barely audible. Opening up to his mom like this felt awkward, but then also extremely relieving. Suddenly a smirk hit her.
"I think I add one more thing to my milk. I am sure you are going to enjoy it..." A brief giggle escaped her before she focused. And then she moved her now almost head-sized tits closer to Max' mouth.

The taste was sweet and delicious, with a wonderful strawberry flavor, just as he had asked for. His lips initially just very carefully started sucking on those very prominent nipples, but when a very warm feeling run through his entire body, that also caused his dick to start raging at his limits, he got so overwhelmed that he couldn't help but to grab that titty with both hands and drink eagerly right from the tap.
"It tastes so good..." he almost moaned, completely ignoring the aching cock under the sheets for now.
"Drink sweetie, so you get big and strong for mommy." Sherrie whispered with love in her voice. And Max drunk. Somehow every sip tasted better, and got him hornier. So he drunk and drunk, till suddenly he felt his dick somehow poking into his mother's tits from the other side.
"What the..." he suddenly snapped back to reality, and when he looked down he noticed that he was sporting not only a raging boner, but one that had to be at least 16 inches by now. "Mom... what did you do?!" he asked in panic, but she just laughed and petted his head.
"Don't worry, it's only temporary." she calmed him down "I made it so that my milk cause some growth for you to enjoy, but it will only last for an hour or so. That way you can enjoy your fantasy, while I can enjoy mine." It took Max a moment to process what she had done. If he'd keep drinking, he probably end up with a gigantic cock and balls. As embarrassing as that was in front of his mom, she made it happen, and it would only be for a while. His breathing became faster when his lips returned back to her still very big tits, that seemed to overflow with an endless amount of milk. This time he not only drunk because she asked him to, nor because of the taste. This time he sucked harder and harder on those nipples, as his inner kinkster was burning with desire. The only size too big for him was what he couldn't hide in public anymore. But this time there was no public, it was just him and his mom, and she supported his crazy wishes. So he drunk, more and more, and felt his cock and balls expanding further and further. Eventually the head of his cock peeked out from between her cleavage, but if anything that just made him suck even harder.
"Yessss.... suck mommy dry!" Sherrie encouraged him, and he was a good boy and would listen to his mom.

Eventually Max had to stop, simply because his belly felt too full to continue. A few burps left him, but Sherrie didn't seem to care. His cock, now wide as a big bottle of coke, reached past his face, and the gigantic head of it rested somewhere on the pillow next to him. Beneath balls the size of watermelons lifted and bulged the sheets. And somehow he felt so complete.
"Sleep well sweetie." Sherrie moved down and kissed him on his forehead "You made mommy very happy today."
"Thank you..." Max mumbled, and instinctively started hugging his massive shaft like it was a teddy bear. "Thank you for everything."
"Sweet dreams." she said as she stopped one more time at the door to look back. The sight of him hugging his own cock put a smirk on her face. If there was anything then she loved to make his son happy. Carefully she closed the door behind her, and gave her much enlarged tits a last check, pondering whether or not she should keep them this size. It did look hot, but she would have a lot of explaining to do. Not only why her tits now rivaled her head in size, but probably also why she was leaking. While inside the room Max somehow drifted into a deep slumber, enjoying the feeling of having the cock of his dreams, soon dreaming of walking around with that thing outside. A hot dream, but then just a dream.