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I like ss because the idea of a woman having sex with a prepubescent boy under the age of 9 years old with a penis smaller than 5.5 centimeters long and possessing a slender circumference that's proportional to its length.
The average stretched penile length before the onset of andrenarche (first stage of male puberty) is about 4 cm (1.6 in), and the length for 90% of prepubescent boys is between 2.4 and 5.5 cm (0.94 and 2.17 in).
This size is unlikely to produce much physical pleasure for her, but our fempedo has the long game in mind: She intends to raise her husband and sexually groom him into her ideal lover, the key to her plan is recipocity; she will give him the best physical pleasure of his life with her body now, and by the time he's reached the age where his penis is at it's fullest length and circumferance, he is the one using his body to give her the best physical pleasure of her life - then she can enjoy all the perks of sex with a shotas boycock and then all the perks of sex with the thundercock of his chad adult form.
So let's say our shota has a micropenis at birth and is fucked and sucked by his mom, aunties, sisters, cousins, neighbours, babysitters, female friends, teachers, nurses, doctors, and every other girl or woman he meets all day every day and night of his life, and we see as he evolves from being a tiny dicked shota who is submissive and hating the sex being forced upon him by everything without male chromosomes to being and absolute chad with a monstercocm dominating and loving sex with all his former rapists and a harem of waifus that hes built beyond even that.