I've been with my bf for 4 years now and I have the exact problem! My bf's sis have big boobs and she always wears very low cut tops - I've caught him looking down her top quite a few times and it makes me sick! A couple of times I couldn't hold it I asked him "what are you doing?" not directly pointing at him for looking down her top and he gets nervous and says something stupid like not much / nothing. He went out of his way to walk over to the other side of the table just to get a better look! Because she was sitting down. I've always thought I was mad for thinking like that but I'm not that stupid to imagine things! Please help!!
