About a month later we were once again in my basement on a Friday night.As soon as my family went to sleep I jumped into action and got dressed.That n...ght I wore a black lace bra with black opaque pantyhose. I hadjust got an awesome leather skirt and thought that tonight I would showhim it. I slid the leather skirt up and over my soft, smooth legs andzipped it firmly in place. It was so tight and showed off my curvy littlesissy boy body off perfectly. The final piece was a form fitting. I knew you could hear him and I looked up at you again. Seeing you watch me caused a wave of heat to wash over me and my breath quickened. I couldn't understand why being watched by you was so arousing but my wet pussy proved it. I squirmed until I was able to rub my clit against the fabric of the seat but it wasn't enough to make me cum. I continued to stroke him with one hand while the other reached under his balls to press on the sensitive spot behind. His grip on my tits tightened and. I reached down and began to unbuttoned his pants. I love feeling a cock get hard. He was bulging and needed to be freed. As I helped free his now fully erected cock from his pants I pressed my body into him his cock between us.He asked “Do I need to get a condom?” “No… I take birth control” I smiled. “are you sure about this?” he asked. Instead of answering him with words I kissed him gently on the lips taking his hand I guided it to between my legs where my clean shaved pussy was. She was right. I was screwed, I had a bulge so obvious in the front of me and I had no way of concealing it. I turned, hoping she wasn't looking, and she wasn't! I was saved, thank God! I walked towards my bag with increasing pace until I saw her eyes lift on me. I froze, and then slowly started to walk again, acting like I didn't see her looking at it. "I don't think boxers would help hide that too much." Her words shot right through me. It was arousing, having my sister see me like that, but.