Introduction: You catch your step-sister reading a porn magazine on your bed. She's very curious and wants you to explain it... among other things...
After a long day, you open your bedroom door ready to flop on your bed. Instead, the last thing you expect to find is already occupying it. Your shy, naive, proper-christian-girl step-sister is laying on your bed reading a porn magazine!
Caught completely off-guard, you stammer: uh, Mary... what are you doing...?
Mary gleefully looks up from the magazine, flipping pages. Hey Guest! I found this under your bed! Isn't it interesting?
You dive forward to snatch the magazine, she nimbly rolls away, keeping out of your grasp Nuh uh uh! I found it, so I'm gonna read it!
She pats the bed next to her Sit down and read with me! I want you to explain this stuff. The other girls at school gossip all the time and I'm getting left out!