Impossible Inocenta, the Tightest Teen (A Hypersexual Diary: The Adventures of Mr. Curvy, Chapter 71‪)‬

Ron is an admitted hypersexual- someone who is obsessed with sex and feels compelled to engage in frequent sexual activity. As an independent consultant and as an instructor at a local community college, he has the opportunity to meet thousands of young women - and many of them wind up naked in his bed.
Although solidly in middle age, he has a rock-hard body and a rugged look, emphasized by a beard and tattoos on both arms. Due to his compulsion, he has had sex with hundreds of women in all manner of situations. Over the course of these adventures, he has learned something about how to give a woman pleasure, heightened by a unique anatomical feature. An old girlfriend bestowed the name “Mr. Curvy” to it, and that name has stuck.
Evoking classic pulp paperback porn of the 50s and 60s, the Mr. Curvy stories are accounts of some of Ron's more recent adventures, and are true stories of real sex with real girls; they actually happened exactly as they are described, except that the names of the women and other characters have been changed to protect their privacy.
In Chapter 71, Ron meets Inocenta, a cute little teenage coed from south Texas, who had confided to her cousin, Kimberly, that she was curious about how it might be to get together for sex with a virile, older man. Kimberly thinks of Ron, remembering her own sweet time with him (See Chapter 37, Kisses from Kimberley). But when it comes time for Inocenta to experience her fantasy, an unexpected complication comes up: The tiny little teen is so tight she is almost impossible to fuck!