<3
I don't want to necessarily drone on, but I did think of a few additions to those suggestions that would add some additional flavor.
Like, Fantasy Request #3, Semen staining. There could be flavor text dialogue that pops up whenever you reach a new level of...coverage (with positive/negative variations in concert with a potential corruption system). Also, flavor text for if you choose to clean yourself off or not.
(Example: low corruption, choose "no," character says something like "It's disgusting, but I don't have time to clean myself right now" vs high corruption, choose "no," "I don't need to clean myself up now...it's so nice and sticky and warm.)
Whenever the game responds to your/the character's decisions, even with a reward as small as a line of dialogue, when taken altogether it heightens immersion a lot.