I had agreed to stay in, as I knew that I would be alone for at least an hour, I decided to be adventurous, so I took another freshly-worn pair of kni...kers from mum's bag, and lay down in her bed, smelling her sweet scent before wanking myself off. I was in full swing when I heard a, 'Mark?' It was my mum, and I was in her bed, wanking with her knickers around my head. I tried to cover up, but I knew she'd seen everything. There was a strange silence once she'd walked in, she didn't shout at. " she asked.I looked at her, she still looked worried."Just some things for John." I replied."Oh er did Bert say any more about Chu', Charles?" Oooh yes, apparently some tramp he has been fucking when he's over here has found out about him and he is none too happy cos she's told him to fuck off." I paused for dramatic effect. Trying to look suddenly horrified. "It's not you is it, do I need to get checked?"I must admit I hoped she would deny it, I wanted to continue the wind up. If she admitted. Her pussy started contracting around my cock, then her body stiffened and just quivered. She let out the loudest “I’M coming, oh God I’m coming”. I clamped my hand over her mouth but it was too late, Candice was awake and just sitting up with her mouth hanging opened. Lidia didn’t look at her, she was still looking at me and said you’re not a bad fuck for a step brother. I was so shell-shocked by everything I was speechless. Finally after what seemed like an eternity, Candice said “well. The timing was planned to give us a few hours before my friends would knock off work and potentially drop in unannounced and my neighbours work a nine to five so they wouldn't interrupt us either. If anyone walked in on me fucking two recent high school graduates, it would be difficult to explain since I'm not out of the closet, to most people.All week I had been fantasizing about these two fit young guys and seeing them walk up to my back patio shirtless, wearing some loose shorts my cock.