MC is a virgin, a social outcast, fell in love with the wrong girl who dated him for a bet.
Get dumped and picked up by an older woman(not necessarily married but someone who is a typical hot MILF who is discreet and targetted our young mc) what do i mean by discreet? is that she hadn't fucked half the men in town. A better term would be is that she is a slut in bed but is 'picky'.
Young mc gets the all the sex he wanted, reshaped and molded by his older lover.
Eventually, his sexual release triggered the release of most of his hormones thus giving him another huge boost in growth spurt in all the right places.
Typical wish fulfillment fantasy but this one is more on the discovery of himself and his older lover and turning into a new leaf rather than stupid sexual encounter chapter after chapter.