I looked down at the glory hole and saw my twin sister with a condom between her fingers saying, "fuck me." I didn't know what to do. Fuck my sister? I felt guilty enough getting a BJ from her but this is definitely next level. My mind then shifted to the thought of how many guys she's blown or handed a condom. The thought of her fucking different guys actually turned me on.
I took the condom from her and the thought of me in school, trying to fuck any girl I could. It was wrong of me to play that game but I still did it. Now was the ultimate challenge for me to fuck a woman and she was practically begging for it.
I put the condom on and put my dick through the glory hole. I felt her hand grab me then I felt her push me into her. The wall was thin but she could only get about 75 percent of me inside. It didn't matter, she was tight and it felt good despite the condom.
I pushed myself against the wall as tight as I could, trying to get all inside her. I let her do all the work. She was backing into me hard and fast. I could hear her wet pussy take my cock at a steady speed. She must have put something in her mouth because she was very vocal but her moans were muffled. Within a minute, my sister had her first orgasm. She slowed for a few seconds but picked up her aggressive pace.
Condoms take away a bunch of the sensations of sex but it also makes you last longer. Plus with me cumming in her mouth the day before, I knew I could last a long time.
I didn't time us but we seemed to fuck for a long time. I know she came three times. During her last orgasm, I was getting close. She pulled away from me and said she couldn't take anymore. I told her I was close so she took the condom off and started to blow me. Once again, she sucked the life out of me.
Within a minute, I was ready to bust. I knocked on the wall and she sucked on the tip and ran her tongue under the head. I began to shoot rope after rope into her mouth as she moaned, taken all of my juices. Once she swallowed, she said, "Your cock is amazing. It fills me up perfectly and your cum tastes great. Normally I don't do this but I need to know who you are. I want to see you outside of here."
I immediately freaked out. I wasn't sure what to do or how Jane would react. I was trying to think of something to say but my mind went blank. After a few seconds, she knocked on the wall and said, "hey." I jumped and blurted out the wrong words.
"No, I can't. It's so wrong, it's so wrong Jane."
I knew as soon as I said her name, I fucked up. My mind instantly went through hundreds of senerios of what could happen and none of them were good. After a few seconds, I heard her calmly say my name.
"John?"