It's your 18th birthday, you wanted to have a big party, and the compromise with your parents was that at least one adult would be there. You had no doubts about who to choose. Mark's mother always pretend to be stern and calm in front of your parents, but when she's alone with you, she gave you carte blanche. Except this time it was... A little different. Usually she left you alone, but now she was clinging to you the whole time. She even sat with you, telling you racy anecdotes about her you...