Fake names, and please don't judge just based on the title. I (23m) was being step up on a blind date by my sister Shay (27f) and her boyfriend Tim (28m). Shay said her friend is shy so it was a double date with me and the blind date with Shay and Tim. At the restaurant, when I met Mary (28f), I thought she was looked hot, and she was very voluptuous. Her belly looked hard in her dress. At one point during the diner, she lifted a glass of wine towards her lips but she then yanked it away. I don't what I was thinking asking this risking question but I asked Mary if she was pregnant. My sister froze and dropped her utensils, and at that moment I knew I made a serious mistake. Mary said no, she's just a big girl and she doesn't drink. Despite that hiccup, the rest of the evening was fine and Mary said she wants to go on a 2nd date. But the next day, my sister was yelling at me. She said I was so rude, and that I called her friend fat. I didn't mean to imply anything but I am wondering if I did. I really like Mary, and I want her to be my girlfriend but I'm afraid I ruined it already. Am I the asshole ?