Looking at her friends play in the water with the pool nooddles didn't help Erika calm down that much. She could still feel her giant clitoris all warm and sensitive, ready to get hard at the least solicitation. "Better get dressed" Erika thought to herself.
"I'll wait for you inside, girls!" she said to excuse herself, still wrapped in her towel. She grabbed her things and went to the bathroom for a change of clothes. Once inside she removed her bathing suit, inspecting her body.
Her breasts were about B cups at this point, her nipples a bit sensitive. Her clitoris had grown to a tiny canine sheath about one inch long. The stimulation, visual and otherwise, seemed to have accelerated the change.
Putting on the clothes she was wearing earlier, she sighed in relief as the pleated skirt part of the dress hid her mutant groin perfectly. Her breasts were snug in the bras Melissa had given her, and not protuding through the shirt part of the dress too ostensibly.
"Hey pretty girl" she heard Melissa say from the doorframe of the bathroom. Erika shuddered in surprised and turned around. It was like she couldn't go anywhere without Melissa following her around.
"I wish you had stayed longer in the pool, the water is pretty nice today" Melissa said with a smile. She drew closer, and Erika could tell from the way her friend moved that the goo she had ingested earlier was starting to influence her behaviour.
"Feeling you against me was pretty nice, too..." Melissa went on. Erika didn't know what to say, so she was twisting her fingers in front of her skirt nervously as her friend walked to her. Melissa was still wearing her two pieces bathing suit, her curves barely contained. Erika knew Melissa made their friends jealous with her early growth spurts, while most of them still wore A cups or B at most.
Melissa leaned on to press her lips against Erika's, stealing a kiss. Before she even realized it, Erika was fondling her friend's breasts and Melissa's top snatched open. Her breasts were still wet from the pool, her nipples hard against Erika's palms. Erika squeezed her thighs together as she felt the familiar tingle return between her legs.
"Wh... what are you doing girls?" a tiny voice said from the doorframe.
Emily was standing there, an innocent look of surprise on her face. Erika froze, but could not remove her hands from Melissa's chest.
"If we tell you, Emily, you must keep it a secret" Melissa started. "You see... Erika and I have found a way to develop bigger breasts. Through massages. This is why we have developped a bigger chest than anyone in class. But you can't tell the others or they may get jealous."
What a load of bullshit, Erika thought; yet she could not say a word. Better let her friend handle this.
Emily seemed hesitant. "Is this really how you do it?" she asked with a blush. "Do you think I could develop big breasts too?" She absentmindedly brushed against her own chest, which was flat as a board.
Melissa nodded, looking as serious as she could.
"I can show you how it's done", she added, a strange yearning concealed in her voice. "Erika, help Emily undress", Melissa said softly.
Erika pulled down on Emily's bathing suit straps, revealing freckled shoulders and a mostly flat chest. Small areolas made two barely elevated mounds with equally small nipples at their center. Emily was turning red but did not protest.
"You see Emily, you have to stimulate the breast tissues through contact. Your family or doctors won't tell you because it may look sinful from the outside, but it is perfectly natural. Everybody does it, but you must keep it secret or they will think poorly of you.
Emily nodded obediently.
"Now Erika, show Emily how it's done" Melissa said with a firm voice. She sounded very professional, even though Erika knew it was all an act so Emily wouldn't find their own fondling suspicious. Erika knew that Piper and Riley had used slurs against girls kissing girls before, and she wasn't too sure about Emily's opinion on that.
Swallowing her saliva quietly, Erika placed her hands over Emily's nipples, brushing her thumbs gently against them. Emily's breathing became a little erratic.
"Do you want Erika to stop, Emily? Maybe you're not ready for this," Melissa asked.
Emily shook her head vehemently; she was not any less than her friends. She wanted to grow feminine curves just like them.
Erika resumed her caresses and soon Emily relaxed, responding more positively to Erika's touch. Soon she was almost pushing herself in her friend's hands. Erika started giving gentle tugs on Emily's nipples, and Emily let out a few very soft moans. Meanwhile Melissa had started touching her own breasts seemingly as an incentive, but more probably because she was horny.
Erika was doing her best to keep her composure, but a storm of lust was rageing in her body. She could tell her mutant clitoris was swelling again under her dress, protuding slightly from the thickening shaft.
"Now Erika" Melissa said, doing her best to keep her tone normal instead of slutty, "use you mouth to better stimulate Emily's breast growth".
Erika was turning red as a tomato but complied. Emily arched her back, exposing her chest more, a look of need on her otherwise innocent freckled face. Erika started by giving a few licks on Emily's nipples, which soon became a gentle sucking.
Emily was moaning softly, when a voice in the corridor interrupted them. It was Melissa's mother.