So we recently went on vacation with my sister and her boyfriend to the Carribbean. For 2 days we took a catamaran and went sailing around some islands. We all shared a single room on the boat since it wasn't that big. Well one night my wife and I decide to head down early to be alone. We finish and I decide I want something to drink so I head up to where the icechest was. To my surprise, sitting on the icechest was my sister orally pleasuring her boyfriend while he does his best Captain Morgan stance in the moonlight. They never even saw me because I immediately turned around and said screw the drink.
My sister and I have lived together before when we were both single so I know what goes on. We are somewhat open about our hook ups and such. But never have I seen it live like that. Since then I can't even look at her the same. Its not like I thought she was innocent before but it's a whole other thing to see her deepthroat a guy in front of you.