I was just walking down the hallway, minding my own business. I thought that I was home alone but the noise coming from my sister's room corrected that misunderstanding. Quite a bit of noise, too. It was obvious that Clair also thought she was home alone or she wouldn't have been anywhere near that noisy.
Seeing that the door to her room wasn't fully closed I assumed that meant it would be all right to walk through it, so I did.
"Hey, mind keeping it down to a dull roar?" I asked on entering.
Then I went silent, thoughtfully regarding two nearly naked young ladies, only one of which was my sister. From the pile of clothes on the bed it was rather obvious that they'd been trying on various outfits. Not my sister's outfits, though. I recognised the box near the bed as the one my mother had been putting in unwanted clothing for the op-shop, both hers and those of her friends. Some of the stuff in that box had been, ah, let's go with outrageous.
The girls had been trying on various combinations and having hysterics about what some people wore. Right now they were between outfits and were tastefully clad in panties and bras.
I suppose I should point out that where Clair and Angela were both eighteen the average age of the women who had donated clothing was fifty plus, and with some of those women it was a very big plus. The clothing reflected this.
For some reason the girls looked a little miffed at my walking in.
"How dare you walk in without knocking?" demanded Clair.
"The door was open," I said peacefully, enjoying the view. Sister or not, Clair had a damn nice figure. So did Angela, for that matter.
"Well, feel free to close it," snapped Clair, so I reached back and pushed it closed.
"I meant with you on the other side of it," came the swift snarl. "Can't you see we're getting changed?"
"Indeed I can. Don't mind me. You go right ahead."
I leaned back against the door in a casual way, ready to flee if I was to be attacked by a couple of incensed young ladies.
Clair gave me an absolutely filthy look and then gave me a devious smirk. Almost evil looking, that smirk. Then she continued to get undressed, panties and bra going by the wayside. I damn well knew that hadn't been her original intention. She was just trying to embarrass me. Fat chance she had of that.
Angel then proved to be a good friend but a little on the dim side. She gave me a defiant look and emulated Clair's behaviour, although she did blush somewhat.
So there I was, facing two young ladies, both starkers, both staring at me defiantly, both within arm's reach, although I don't think that that last bit had occurred to them. I suspect that what I was supposed to do at this stage was to vacate the room, leaving them with their victory, the evil forces of masculinity defeated.
Unfortunately, instead of retreating, I took advantage that they were both within arm's reach. I reached, cupping and stroking one breast per lovely. I'd like to have stroked both breasts of one of them but didn't want to show favouritism.
There were shrieks from both girls as they slapped my hands away.
"How could you?" yelled Angela. "Clair is your sister."
"Um, step-sister actually, and it's just a bit of gentle petting. Actually, what I should be doing is spanking the pair of you for acting in such a brazen manner."
"You wouldn't dare." Angela barely breathed the words out but I noticed Clair said nothing. She knew I would dare as I'd actually spanked her once before for some exceedingly rude behaviour. She'd deserved it and she knew it and hadn't dared to complain to our parents in case she got a second spanking.
"Oh, I think I would. I also think I should. Come here, Clair."
