As the second of three sisters, it was pretty easy just not to be noticed in the family. A lot of middle kids can really resent that, but not me. Ash broke the parents in, and paved the way for me and Tia, and Tia was such a handful, they were too exhausted to care about the smaller liberties I took. It got to the point where I could practically walk the house naked, whistling Dixie, and no one would notice, and that’s how I liked it. It let me see a lot of things in the family that might otherwise be considered private. I watched my parents making love more than once – one time they just started on the couch while I was reading in the kitchen, thinking the house was empty. I watched the whole thing through the open doorway.
So maybe it wasn’t surprising that Tia seduced Ash’s college boyfriend on Sunday during Christmas Vacation when the rest of the family was out shopping. I had slept late, like I like to on vacation, and woke only because the sound of sighs and weak male protests weren’t quiet at all. I walked down the hall to the den, where Ken supposedly slept while he was staying with us, though everyone knows he snuck over to Ash’s room most nights. This time, when I reached the open doorway, I certainly saw Ken, but he was kneeling naked on the air mattress with Tia, also naked, straddling his lap. It was obvious what was happening. And, while I was a little shocked, I was also pretty impressed. I knew how big Ken was – being invisible has a lot of advantages, as I’ve said – and Tia was pretty damn small. She must’ve been stuffed absolutely full by that cock, but only gave away sighs and shivers of pleasure. I have to say that gave me a tingle or two myself.
As involved as she was fucking her sister’s boyfriend, I was impressed Tia noticed me. Not that I was hiding, but I guess she was still on the lookout for the rest of the family coming home. She didn’t look guilty or embarrassed at all, though. She just kept rocking, sighing louder, sparing a moment to look me in the eye over Ken’s shoulder and put her finger to her lips, like I’d be making any noise or try to stop her. Of course I wasn’t going to. That’s just not my style. But I did stay and watch as Tia rode Ken to her own climax, and then his, letting him cum deep inside her as she bucked orgasmically on him.
I was gone before they pulled apart. At that point the real question for me then was not whether, but when I’d have my own chance at Ken. There was no way he’d turn down a fuck with the third of three sisters, and I was curious about a cock that size…