Your sister catches you jerking off with her panties when she comes in to tell you Mom wants you to do something. You sick little pervert... don't you know how wrong that is?! She then confesses she wore those panties while she fucked your dog. Are you seriously turned on by that? I'm not surprised given the circumstances. But ya know what's really funny? Your dog has a bigger cock than you! LMAO! Your sister will go on to belittle and make fun of your tiny prick as she also tells you even deeper family secrets about Mom & her, your dog and well... every dog in the park.