My sister-in-law and I are very conscious of each other. While their parents were away on a trip, they finally kissed...but her sister-in-law refused to have sex with her, saying, ``Once you have sex, there's no way to stop it.'' But I can't resist it, so I can't stop wanting to insert it even though it's supposed to be just rubbing it with my bare thighs! My sister-in-law also had the same feeling and while we were rubbing each other, we pretended it was a coincidence and started to insert it! non-stop and intense