You're in the jacuzzi with your little sister one night.. she's being kind of weird and keeps looking at you... Your sister looks at you and says "I know I'm your little sister so I might not know very much... but I DO KNOW it's kind of weird how many girls you bring over to the house... and they always leave before mom and dad get home.." Your sister is curious and keeps bugging to know your business... she wants to know what's really going on in that room when you're with those girls... she teases you about how she can hear.. mimics them even... practically begs to see it... and gives you plenty of reasons why its not weird... you show her your cock and she automatically realizes why she can hear everything. Its huge!! Its massive!! She can't help but want to touch it...