idea mutations
i was watching the pictures and the gif of a girl slowly becoming bigger got my attention
so my thought is how about a lab and mutants who can infect the player and the people who at random attack people
2 of these could be starting small like a dwarf but as you fuck you basicly have a body that starts stupid small but over time starts to become a giant pussy and cock also adapting with this size diff it basicly universally increases stuff
another one could be a unnaturally horny futa or male who has a bitch breaker cock think the size of a horse or even larger they basicly break the hips of whoever they fuck and after they attack the player you wake up in the hospital as you recover later at night if your fucking someone your cock expands inside of them but if you goto sleep a screen plays out of the cock expanding