Melissa lay in a sleep that was more a state of unconsciousness, between a doze and true sleep, the contraceptive called plan B started to battle with her hybrid baby. The hormones the pill released were designed to stop the sperm and egg from meeting. The seed Erika had shot into Melissa's womb was a scope and a type that the makers of plan B had never expected.
The far from normal seed started to adapt speeding up to find an waiting egg. Melissa started to moan softly as the salve in her body reacted like high octane fuel inside her, conception on supercharge. The pressure was uncomfortable, but not painful, and steadily increasing. Rubbing her belly while in a daze, Melissa stopped for a moment as a frown creased her sleeping face. As the pressure grew, it seemed to push out against her hands. Melissa felt her belly pushing outward, pushing the fabric of her pink nightgown.
Still oblivious, her belly forced the fabric of her nightgown so tight it started to tear, showing bits of her swelling flesh. Tighter and tighter they stretched, until ripped clean in half showing her bulging stomach. Her belly, now uninhibited by the nightgown, seemed to grow faster than ever. At some subconscious level Melissa realized her belly wasn't all that was swelling. Before she knew it, before she could even try on so much as a she could remove her bra, she her breast swelled, and they were pushing outward like fleshy balloons as if to catch up with Erika's belly.
Pushing the cups of her bra now and rising like mountain tops, with nipples, from her chest. Melissa started to stir as she felt her weight on the bed as the metal groaned. She tried to stand but Melissa's petite legs began to wobble, as she was suddenly carrying a lot more weight than she was used to. Melissa leaned against the wall, her growth slowly forcing her into a sitting position. Just as Melissa's thoughts turned to fear that she would burst into a million pieces soon, the pressure slowed, and stopped.
Feeling too heavy to move for the moment, Erika simply ran her hands across her newly-aquired form. Looking at her belly and breasts, a sudden thought crossed her mind. "I'm...pregnant!"
"Ooh!", Erika gasped, as her hands flew to her swollen belly. She felt something strange. At first, she thought that something else about her was about to change, but then she realized that that wasn't it... whatever she was carrying within her was simply kicking and rolling.
"I'm pregnant", she repeated in amazement. "Like... REALLY pregnant!"
As if in reply, another ripple of movement washed across her rounded form, and she watched in fascination.
"What has this stuff gotten me pregnant with, though? And what'll my family say when they see me like this?", she wondered.
For now though, she simply sat for a few minutes to regain her strength, and then tried to stand up again. It took several more minutes of effort, and a little practice balancing against her dresser, but she found that she actually could still stand and walk, although she had to move very slowly and with a distinct waddle now that she was so big and heavy.
She glanced at her mirror, and had to giggle at herself. She was quite a sight. A thirteen year old girl with such a huge pregnant belly, and her new large breasts sitting on top of it. Now that she noticed them, she felt herself up in curiosity, and was amazed at how sensitive and wonderful they felt. They were even bigger than her mom's now.
While playing with her nipples, she was surprised when two streams of milk suddenly shot from them, smacking against her mirror.
"Whoa. I really didn't expect that.", she said, and went about cleaning up the mirror and herself with a towel. No matter how well she dried herself, though, her long dark nipples continued to slowly drip and ooze.
Experimentally, she took one in both of her small hands, and lifted it up. With it's new size, the nipple was now in a position where she could reach it with her mouth. With a little trepidation, she wrapped her lips around her teat and began sucking, and was pleasantly surprised by her own milk's odd yet sweet taste, as well as the erotic stimulation that she was giving herself.
After a while, she drank her fill, burped, and giggled again.
"This is all amazing!", she said with wonder, while rubbing her large belly.