My sister-in-law asks me to eat her pussy, I don't believe it

It's normal that you're surprised by such a request hehe, who the hell does the sister-in-law ask to eat her pussy? It's never happened to me and I don't know any friends who have had something similar happen to them so we'll have to think that in the end it's all because this is a XXX porn video and these things only happen in porn videos, that's the only explanation we can give.