I had been living with my female roommates for the past few months, until my new male roommate moved in. We were all a bit taken aback by having a guy around, as we had grown accustomed to being quite open with each other while getting ready for nights out - even showering in front of each other. We all agreed to not act on any feelings we had for the new guy, but I couldn't help but flirt with him a little. One day, I joked about leaving the bathroom door open while I showered, not expecting him to take me up on the offer. I was surprised when I heard him try the door and I realized I had left it unlocked. He stepped in and smiled, watching me as I showed off my body to him. I knew I shouldn't be flirting with him, but all I had done was leave the door open. He pulled me up against him and I could feel his erection as he locked the door. With no one to interrupt us, he pushed me down onto the sink and took me from behind. I watched myself in the mirror as he moved inside me, struggling to hold back the moans of pleasure