It would never have happened if I hadn't overslept and taken the day off work.
As it was I was lying on the couch in my pyjama bottoms when my ma came down the stairs wearing nothing but her bra and knickers. She didn't see me at first, so I had time to take a good look at her. Her middle aged tits weren't huge, but they were big enough to make her bra sag a little. Same with her belly. Just bulged a bit over the top of her knickers, but what really caught my eye was the way her plump pussy lips formed a perfect camel toe. I groaned as my cock started to get stiff, which struck me as a bit weird because I'd never thought of her in that way. She'd always been, well, my ma, but now she was most definitely a woman. That was when she saw me.
"Oh shit!"
She was going to say more but the doorbell rang. She went to answer it, and I heard a man's voice, abruptly cut off by her urgent whisper "We can't today, my son is home," then she slammed the door and rounded on me. "What the hell are you doing home?" she demanded. When she realised I was looking at her she glowered. "What are you staring at you pervert?"
"Um, nothing ma. Who was at the door?"
With no way to cover up she glared at me defiantly and snapped, "That's none of your business, and don't lie to me you little shit! You stayed home hoping to catch me naked!" There was a weird look in her eye as she said it.
It wasn't true, but I saw no point in denying it as she would believe only what she wanted to believe.
She stood glaring at me with her hands on her hips. "Well you've seen all you're going to see." My ma took a step closer and looked down at her overflowing bra. "Did you hear me? You ... are ... not ... going ... to ... see ... these!"