Is AUTHOR wrong in the post ? POST : So to give a little back ground I am 25 Yo M and my cousin sister is 19 Yo. I am quite open and generally don't like to follow social taboo's and unspoken rules. Recently we were talking about stuff and having a good discussion about general things in life, so she starts telling me about this creep who texted her some lewd stuff and his sexual fantasies. While discussing further i got to know that she is facing a lot of problems with peer pressure as she doesn't know what exactly happens during sex and feels quite ashamed when her friends talk or discuss about this. Some of her friends suggested watching porn but she is quite creeped out from the general thought of it and i strongly agree with her as porn will distort her expectations which is no good at all. 

This did not seem so bad until I realized the extent of peer pressure and self esteem issues she was having. Since she does not feel comfortable discussing about sex with parents, she asked my help to explain her questions and general sex ed when no body is home.

I don't mind the whole situation but I am not sure if I would be a creep or will this situation be borderline incest if i have the talk about birds and the bees with her. Also i do not want her to watch and learn from porn as it is quite far from what happens in real life (excluding kinks). 

So my question is WIBTA or somehow negatively influence her if i go through this ?, will this in any way give off incest vibes ?   