My girlfriend absolutely won't let me have sex without a condom! She hands me a rubber before penetration, and raw sex is still off the table... I've been fantasizing about when she'll say "It's okay to do it raw," while yearning for the sensation of raw sex, but her sister has been tempting me with the offer of unprotected sex while flaunting her big breasts! I like my girlfriend, but I can't resist this temptation and opportunity! As I was kneading her bouncy breasts and going at it with her sister, I finally got caught by my girlfriend! But it felt so good that I ended up ejaculating inside her sister's vagina in a big way!