I understand some of the feeling here about limiting the perversion, but only as it fits in with the premise and the story.
I have no problem with, and actually like playing the good guy every once in a while. It's all about being 'story appropriate.'
Having an incest story where the mom gets hammered and passes out half naked on the sofa without any perv scenes is an excellent way to piss off a lot of players/readers. Don't feel bad about putting it in there. This is what options are for, but I can assure you, that as far as that particular part of the story goes, most are going to opt for the grope.
The story has to lend itself to the no perv route in order for it to work successfully, otherwise it will just be seen as a missed opportunity. Let's be honest, most 'good guys' are going to avoid incest all together. A 'good guy' incest story is really a 'flawed guy trying to convince himself he's good' story. Nothing wrong with that. We're all flawed, and most would definitely consider incest perverted. Doesn't stop me from loving it.
"Yeah, I screw my sister and my mom, but I would never grope anyone...I'm not a pervert!" LOL. See the flaw in that thinking?