After playing around in the original COC, I'll create a little list for what I would like to be added in the sequel
More creativity in sexual encounters, example being oviposition scenes involving getting fucked by an ovipositor, like the scene from COC involving bee humanoid using their ovipositor to insert eggs inside the champion. Cant think of any more ideas, but occasionally more than a regular penis would be interesting
More base male/female, dickgirls, traps or other variations are perfectly fine but TiTs had an exceedingly large amount of Dickgirls, so much so that most NPCS that look female would somehow have 12 inches completely hidden.
Dragon girls! It can vary from dragon humanoid to anthro, but more dragon girls would be a very welcome edition (bonus points for fluffy dragons)
Cute/sexy, the ultimate mix. I absolutely love the mix between cute and sexy, and its sometimes nice to not always have complete sexual frustration and instead some cute loving!
Addictions. This could be done as both a gameplay mechanic and something that some may find sexy. In the first game, the champion could get addicted to various substances like Marbles Milk or Minotaur cum, so something like this that gives consequence and potential bad ends would be interesting. As for what the player could be addicted on, likely something sexual, one example that is an unpopular opinion that I liked from TiTs were the venus pitchers, whose encounters were purposely selected by the player, and having the player becoming more submissive to the venus pitchers and allowing them to activate their control and breed the player I found very sexy.
Tattoo/Piercing. I remember reading earlier in this thread of the idea of "marking" and I am completely against the idea of getting pissed on but instead if the player fails an encounter, they get tattooed or branded by the enemy, like a tramp stamp showing that they are their "property". Alternately, it could be player choice, but it could be more impactful if it is forced upon the player
Tribal/primitive. Missed opportunity in the original COC was having an area of low tech civilization, like perhaps tribes with primitive weaponry only wearing clothes that offer sexual tributes to what they believe are their gods or actual magic thats beyond comprehension. Basically I want Krystal, no one would be upset to have an npc inspired by her.
More focus on different damage types during battle, like enemies that focus exclusively on fighting or wanting to seduce and fuck the champion
Demons! Corruption is one of the biggest focuses of the game and what are mostly thought of when thinking of corruption, demons! We did have a bit of demons in the first game but it's always fun to have some sexy succubi tempting me to becoming corrupted!