Letty came to realize that she was not like other girls now that she was in high School. When she was younger, she was what the “old Folks” would call an “early Bloomer”. She had prominent Breast Buds when she was just 7 years old. She started her Menstrual Cycle when she was only 9 years old and had large Nipples and Dark Areola already. When she was 12 years old, she was tested to have a high IQ and skipped a grade in Middle School to straight into High School, where she seemed to fit in initially as she looked more like 14 or 15-years old instead of 12 because she was tall for her age and had mature curves with a full C-Cup Bra size; but after a few months there she began to notice how she was different.
Depending on the time of the month and her Period, Letty’s Breasts would go from her normal full C-Cup size to almost a DD-Cup size; which would happen fairly quickly. As she would say; “My Boobs feel like they are blowing up as I get me Period!” and her Nipples would Swell Up like Champagne Corks that were impossible to hide during that time. After her Period stopped, it would take another week for them to get back to their regular size. She had to keep 4 different Bras and Shirts in her Closet to accommodate this bizarre phenomenon. This weird metabolic activity that Letty suffered from made her the object of Lust for many of the Boys and of Envy for most of the Girls around her, except for a few close friends. One of them, Rhoda, who was 2 years ahead of Letty as a Junior, but actually 5 years older then her in age; was Bi-Sexual and found herself becoming aroused when spending time with Letty during her Period. Rhoda would notice Letty’s Bra outline under her Tops becoming tighter and tighter as Letty’s Breasts started inflating during these time, and she herself felt her Nipples swell up hard and taut as her Pussy became wetter seeing Letty Breasts “blow up like 2 Big Balloons!”.
When they were studying alone one day in Rhoda’s Bedroom when nobody was home, towards the end of Letty’s Period when her Breasts were Swollen to their largest size; Rhoda slowly reached around Letty’s shoulder and began to fondle her Fat, Engorged Nipples and Letty gave a small yelp of surprise! As she turned to face Rhoda to ask her what she was doing, Rhoda pulled Letty’s face close to her and gave her a deep, probing, long French Kiss while continuing to fondle Letty’s Breasts… which began to inflate in brief, intense spurts like someone blowing Air into a Balloon. Both of the Girls looked down at Letty’s now G-Cup Balloon Breasts and the deep Cleavage that her tight Bra created trying to hold those 2 Huge Boobies; and Rhoda reached under Letty’s Top and under the tightly stretched Bra to release the Clasp to undo Letty’s Bra which popped off with an audible “Thwack”! With the skills of someone experienced, Rhoda slid Letty’s Bra out over her head and threw it in Letty’s Backpack; then gazed in wonder at Letty’s Over-Inflated Balloon Boobs that hung round and tight on her chest, her huge Nipples protruding over an inch and sitting on Swollen Areola as dark as Chocolate. Rhoda felt her Pussy getting increasingly wetter as her own Nipples stiffened in excitement. She knew what she had to do, but she had no idea that Letty had no idea what was about to happen… and in reality, neither did Rhoda!
Letty was in a daze while all this was going on… her head was swimming in a confusion, her heart was pounding in excitement and her virginal Pussy was feeling pleasantly strange, like when she used to “play with herself” over the years, but stopped when she noticed her Breasts would blow-up so quickly that she was afraid they might Burst like real Balloons! It felt good masturbating in the beginning when she could stop after a few mini-Orgasms, but when she felt herself going too far in her “explorations” of her Body, the shock of her rapid and massive Breast Expansions began to frighten her the last time when her Tit-Skin stretched so Tight that she didn't think she’d get any larger, she’d just burst into a million pieces, and she never got herself in that position again. Until now.
Rhoda gently guided Letty down onto her bed and lifted her Top over her head, freeing up the 2 biggest and rounded Breasts she had ever seen, even compared to the Fake-Tit Adult Film Stars in her brother’s porno magazines. They really did look like 2 Over-Inflated Pink Balloons, topped with Bloated Areola and Swollen Nipples. She began to fondle Letty’s Huge Breast Balloons and found them to be stretched so tight that Rhoda thought they might actually burst like real Balloons… just like Letty thought during her last masturbation session. Rhoda began to suck Letty’s Swollen Nipples, which made Letty both groan and squeal with these new sexual feelings as her ready-to-pop Titties grew even more… making those stretching groaning sounds like Balloons inflated to their Bursting Point. Rhoda reached down to undo Letty’s Jeans, pulled them and her Panties down and saw the soft, downy hairs of Letty’s Pussy… which she began to finger smoothly, gently, but with growing intensity and Letty’s breathing became faster and deeper, and her massive Tits continued to inflate beyond their capacity. Finally, Rhoda went down on Letty’s sweet Pussy and began to eat her out with such intensity that it even frightened Rhoda… but she couldn't help it as she playing with her own Pussy, parting her juicy Lips and thrusting her fingers deeply inside herself. The sight of those over-blown, swollen, ready-to bust Balloons on Letty’s chest was just too stimulating and she needed release from her own built-up pressures!
Rhoda was moaning in ecstasy of her Balloon-Tits Girlfriend, Letty was squealing with the new-found delights of sexual pleasure and neither of them noticed how Letty’s Breasts had stopped growing as they both climbed that incline of feelings to reach their mutual Climax… their potentially Explosive Climax… when suddenly {to be continued}