This was a CYOA comic series by Juindalo that take place in an anthro world where there is an overpoulation problem and to solve the problem by turing half of the world's population into genitals of the other half.

...I feel WHAT the transformation was, REALLY should be in the tags...At least it explains the kink quickly.

Base +6, Miko Neko +7, dogbertcarroll +13, Magatsuko +6