Ask her to strip inside in front of window

“Well ok but on one condition. You have to strip naked and it have to be in front of a window.” I didn’t want to make too easy for her.
“What!! I’m not sure… Maybe if you’re not inside I’ll be less shy. Maybe... Could you watch from outside?”
That backfired a bit on me but “OK.”
She went inside while I went outside. I was about midway between the house and the street. I saw Claire going in front of the window but the lighting was bad. She was hesitating so I took the opportunity to ran inside and told her to turn more lights on. She was even more afraid after that.
I made some dance move and that seemed to relax her a bit. I made a “wait” sign and ran back inside again and put some music on. Outside again I danced to the beat and she started to get more and more relax. I felt a bit weird dancing topless outside alone but I really wanted the reward so I continued on.
Finally, she got more comfortable and removed her shirt. She was wearing a plain white bra but still very nice to look at. Next her shorts were lowered and I saw her white panties with pink dots appear. Again not the sexiest but very nice to look at. She dance some more and I was getting worried. She kept glancing out the window to see if someone was there and each time I also looked around also. After about two minutes, which seemed like 15 to me, she turned her back to me, undid her bra and let it fall to the ground. She turned back toward me with her hands over her breast. She was spilling out of her hand while she looked again if someone was there. I didn’t care this time, I just wanted to see them.
She looked at me and saw my intense look. I think she liked it because she made a little smile before dropping her hand. Wow, her tits were wonderful!!! A big D-cup very firm and… haaa! My hands and mouth long to touch and suck them. It was more a reflex than anything planned but my hand went inside my shorts and I started to stroke my cock. It was her turn to get an intense look because in the end, she was stripping to see me masturbate. After watching doing that a bit, and not really seeing anything, she turned around and dropped her panties. Fuck her ass was great! She quickly spun back but with one hand before her crotch. I was even more turned on so I undid my fly and took my cock out. I was soon very hard and she let her hand dropped, letting me see a small patch of blonde hair that was trimmed but proved that she was a real blonde.
We watched each other and I saw her hand move closer and closer to her pussy until she was rubbing it. We were both masturbating when a car turned into our street. I moved so the car wouldn’t see my erection and I saw Claire quickly moved from the window. The car passed my house but stopped just next door. There’s a hedge between our house so I was partially hidden but I still hurried inside without looking back.
I got into the house and looked for Claire. I found her in my room… Wow Claire totally naked in my room!! We looked at each other then I said: “That was really exciting.” She just nodded to confirm that she thought the same. I undid my shorts and dropped them to the floor. She looked at my cock and smiled. She moved toward me and took my cock in one hand. She moved so close that her tits were brushing my chest and it felt so good… She kneeled in front of me and looked up while masturbating me. At that moment, I so wish I had a camera to capture the moment. Her head moved forward and my cock was engulfed by her mouth. I almost came right there. She gave me three long and wet stroked before continuing with her hand. “Sorry but I prefer a wet cock.” I sure wasn’t going to complain.
She got up again and went to the side of me, her breast press against my side, I put my hand around her waist as she took my cock again and continued to stroke me. “Come on, I want to see you cum. I want to see your spunk shoot out of your cock.” She picked up the pace and I started to massage her ass. She wasn’t letting me any chance of holding so I let myself go and came all over my bedroom floor. When I was all empty, she whispered “Thank you” in my ear, slap my ass and left. I wiped the floor with a dirty t-shirt and went to take a shower. I really thought she was gone and was a bit surprised when the bathroom door opened and Claire was there. She just stayed there in the door frame, now completely dress, as I finished washing myself. I got out I started to dry myself. She had a small smile while watching me. I looked at her as I put the towel back on the rack, wondering what was next, and I think she saw my interrogation because she started talking: “Some dared me.”
“What?”
“Someone dared me to do this but I must admit it was a lot more fun than I thought. I hope you’re not mad. I recently joined a dare group on the internet to have some fun and after telling my encounter with you and someone dared me to do this.”
Well a very beautiful naked girl just put on a show and gave me a handjob. “No. If you have more dare like that I will gladly help.”
She thought a bit and smile. “Maybe you could be of help, either as a lookout or as an accomplice. Plus, I wouldn’t mind seeing you naked again.” And she looked me up and down again as I stood there feeling very naked in front of her, even, if I must admit, that I was kind of liking it. Still, I was a bit uncomfortable.
“If you don’t mind I kinda would like to get dress because I feel naked.”
She laughed a bit then added: “That’s because you are!” She had a big smile and I could only smile back. She moved toward me and gave me a small kiss on the cheek while grabbing my ass and turned to leave. “Thank you! I’ll call you soon for the next dare.” And with that she left for real.