incest for sure but bonus points if it leans toward /ss/ content. especially if the mom, sister, aunt or whatever comments on how physically smaller the mc is.
it was one of those shitty cartoon sites where you click a pic and it just keeps leading you to site after site. free cartoon gallery or something like that. i think tram param right?
oh wow they really hit it out of the park with that casting. that bit at the end where they are stacked on top of each other *mauh* couldnt think of a better ending.
for me size can be a sliding scale for the mc. what matters more is how everyone else reacts to the size. whether positive or negative there has to be a reaction otherwise its like "oh hes just whipping it out w/e time for sexy"