Jessie went next door to Susan's place. Susan answered the door wearing a nightgown that was fairly sheer (and it was obvious she wasn't wearing anything underneath it). "Come on in, honey."
Once inside, Susan kissed Jessie lovingly. "I really liked how aggressive you were getting last night. Will we see more of that?"
Jessie blushed. "Uh, actually I had something else in mind. Do you mind if I take a shower here?"
"Mm, not at all. Can I join you?" Susan put her arms around Jessie.
"Uh...sure....that'd be great." Jessie would have to try and keep the CHANGE A DAY off of her lover.
Susan untied her gown, giving Jessie a look at her nude body as she pulled the taller girl to the bathroom. Jessie undressed as Susan turned on the shower, and they got in, one after another. Susan took the initiative, and started kissing Jessie's abdomen. Being driven wild by the attention, Jessie hurried to lather up with SHRINK before Susan did anything that would completely rob her of free will.
She was mostly done by the time Susan reached her pussy, and then all she could do was cling to any handholds that presented themselves and try not to fall, as her legs soon lost all strength. Susan got some of the SHRINK on her as it washed off of Jessie's body...she just hoped it wouldn't affect her much.
SHRINK smelled like flowers...violets maybe? The effect tingled all over her body, and it only added to her excitement. Unlike her own shower, Susan's hot water heater was quite large, and she had enough time to come before the water turned tepid.
By the time they got out, Jessie was shorter than Susan and still shrinking. For her own part, Susan did seem smaller as well. After toweling off, Susan wasted no time getting to the bedroom. She clambered onto her bed, already below 5' tall, and helped Jessie up, who was close to the 4' mark.
Susan took the initiative this time, as Jessie continued to shrink. Soon she felt like a child next to her lover, and her shrinking only seemed to serve to make Susan more excited. Soon she was small enough that Susan was able to hold her as she lovingly teased her pussy.
Jessie nearly passed out from the pleasure, as Susan's tongue became ever larger inside her. Soon it couldn't even fit at all, and Jessie was straddling her lover's tongue. Susan grinned and put Jessie in her mouth, holding her lightly with her teeth at her waist to keep her from falling in.
Jessie felt like her lower half was melting- Susan was so warm, and the tip of the larger girl's tongue was trying (but failing) to find purchase between Jessie's legs.
"Put me inside you!" Jessie moaned, her voice high pitched and tiny.
Without having to be asked twice, Susan took Jessie out of her mouth and spread her legs, pushing the tiny girl gently into her pussy. Jessie was not quite small enough to fit all the way, as her hips blocked entry, but she was able to squirm into a position where she could reach Susan's clit, and she she rubbed her body against it.
It didn't take long before Susan completely lost it, and came all over the tiny girl. They lay there like that for a time, with Susan panting and short of breath, before Susan grabbed Jessie and licked her clean.
She then placed Jessie between her now gigantic breasts. "Oh God, honey...that was amazing! I love having a smaller lover!"
Jessie was forced to spend the day at Susan's, as neither of them had clothes that fit- Susan had shrunk to the size of a nine year old girl, and Jessie was inches tall. Not that Jessie minded- this was still her summer vacation, and being Susan's plaything was an incredible experience.
She woke up from a nap later that evening to find herself in the bathroom, restored to her full size. She was sad it was over...but quickly got dressed and slipped out to go home- she needed another bottle!
Her choices were dwindling, however...