I've played several sequential versions over the past few months and am loving the way the game is progressing. This is easily one of the best adult games on the internet, and really the only one like it I've played. The sexual combat system you've come up with is a thing to be proud of for sure. But I've noticed something strange about the way the 'Top' skill that you get ranks in from being on the giving end of sexual encounters actually works. You would expect that skill to represent your experience topping, and how good you are at dominating others sexually. It's even listed in green on the character status menu, implying it's meant to positively impact your performance.
However, the opposite is true. With more experience and higher skill, it becomes harder to successfully dominate opponents sexually because you cum easier and easier. I've even tested this in the first fight with a werewolf, while fucking her I got 1 point of top per round or so, which made it real easy to see how Hiro's lust and pleasure grew more and more each round performing the same action (starting at +2 per round and ending around +10). The effect on the werewolf's lust levels were not noticeable (+4 per round throughout). These high levels of sensitivity persist throughout the remainder of the playthrough. Once maxed out at 10 top skill, Hiro progresses through the stages of erection in 2-3 turns each, where as with a low skill it takes much longer so Hiro is much more likely to outlast his opponent early in the game than he is later.