From a Track Star to a Busty Nerd Vol. 2 - From a Track Star to a Busty Nerd, #2

Carly, the 23 y.o. track star turned into a busty nerd, tries to run from the consequences of her indulging her newfound desire for her science professor. It is almost impossible to run with breasts and butt cheeks that are the size of basketballs, though. And it's completely impossible to run from something you're literally carrying inside you... A female hourglass expansion story, with pregnancy also being one of the themes.
The main character turns from a tall, sporty tomboy into a petite, voluptous, girly nerd. She does not want her body to stay this way, but, due to her own indulgence and not reading things thoroughly, there's little she can do about it now.