Living with my step sister has been weird ever since my dad remarried a year ago. My step sister, Clarissa is tan with long black hair and has the habit of going around the house wearing very little, she lounges around in her underwear, and often walks to the bathroom topless with her round breasts bouncing every which way. If this isn't odd enough I swear she has an interest in my body, she has on many occasions accidentally barraged into the bathroom when I was taking a shower, and is always staring when I walk back to my room in a towel, my conviction of this was proven this summer in the incident I am now going to relate.
I forget exactly how it started, but we were watching some show sort of like the price is right, to make things interesting Clarissa said we should bet on which of the two teams would win the main prize and the loser had to strip naked, she picked Red, I picked Blue. When Red won she got the biggest grin on her face and said strip, I told her to fuck off I am not getting naked, I thought you were kidding etc. And walked away.
Later that night my step mom called me downstairs. Clarissa it turns out had used the recording app on her cell phone, and had my voice swearing to the bet. My step-mom had worked in Vegas for years and hated when people didn't own up to bets, what happened next shocked me, she told me that as punishment I was not allowed to wear any clothing in the house starting now. I was speechless and froze, but then she told me that if I didn't start stripping she and Clarissa would hold me down and cut my clothes off with scissors.
I sighed and pulled my tee over my head, untied and removed my sneakers and socks. At this point I noticed that Clarissa was staring at my abs. I then unbuckled my belt and let my jeans drop to the kitchen floor, I was now standing in front of them in nothing but my boxers, and worse yet I was starting to get a hard on because Clarissa was wearing nothing but a tee shirt and panties as usual.
I slid my boxers down causing my six inch dick to pop out straight in front of them, my total nudity was complete and at that point I thought my humiliation. It turns out I was not allowed to cover myself, if I did it again my Step-mom threatened an extra week. It was also dinner time, and not only did I have to sit my bare ass on the kitchen stool but I had to deal with Clarissa occasionally rubbing her hand against my crotch.
When dinner was over I had to clear the table and right in front of my step Clarissa gave me a firm slap on the ass, causing me to spill the remaining spaghetti sauce all over my stomach. My mother told Clarissa to stop humiliating me. At that point Clarissa put on a repent face and told me she was sorry, and to my own and step mother's surprise said she would join me in my week long nudity to make me feel better, as I mopped up the pasta sauce, Clarissa quickly pulled off her top and slid out of her panties, revealing her beautiful slim body.
She then grabbed my arm and told me I need to be cleaned up, she practically dragged me upstairs in the shower. She then turned on the water and started rubbing me down with soap but then started to focus on my dick, moving her skinny soapy fingers up and down which throbbed with excitement. Within a minute I shot out a huge load that hit her in her stomach. She slept in my bed that night, and we both didn't get dressed that whole week. Best summer ever.