He put some trousers on and casually went over to the bathroom door and knocked."Are you decent?" he asked."I'm in the bath but I can't reach my back....Can you scrub it for me," she replied."Sylvia, you just had a bath, didn't you?" Yeah, but I want another one. So could you scrub my back or not?" Sylvia said.Ryan gulped and opened the door and told himself not to get aroused again by his sister in the bathtub. He walked over and crouched down behind her and took the sponge she gave him and. I got her to stand up, and I admired her hard member. 'What do you say?' I lowly growled. 'Thank you, master.' she replied with a cheeky little grin. I opened up a drawer underneath the coffee table and took out some black stockings. 'Hands together, out in front of you!' I ordered, and Babs obediently complied. I took one of the stockings and tied it firmly around her wrists, the other, I tied over her eyes. 'Can you see, slave?' I asked, gruffly. 'Not much, master', came the response. 'You. It took about 2 months to talk my sister into a threesome. So I set it up when my wife was going to see her family. First my sister came over to the house. She asked me who the other woman was but I wouldn’t tell her. I gave her a drink and we sat on the sofa. After her third drink We started to play around on the sofa when our mom came in. At the time my sister was giving me a blowjob when I saw my mom. She was staring at us. I told my sister that the other person was here. My sister turned. I was scared. But I wasn’t going to stop.I looked down at my hard cock, and pulled the skin back exposing the hard shiny purple knob. For some reason I spat in my hand and started to massage the warm liquid over my glans. My school trousers were now down below my hips and I had to keep my legs apart to stop them from falling down completely, my underpants were also below my hips and I felt totally exposed as I carried on rubbing.I heard footsteps entering and quickly pulled up my trousers as.