They were humping each other when I walked in, and they turned their heads when they heard me.They just smiled at me, and then returned their focus to each other. "Yeah, they told me I should go relieve myself." Kat burst out laughing, and it put me at ease. " "You can look at me if you want," she said, with a kind of softness that told me she was very aroused by the thought of me watching her while I masturbated.
Like our parents, she never seemed bothered by it, in fact I think she felt embarrassed or flattered, because she always smiled when she saw my hard dick.
Sometimes I think she would bend over right in front of me on purpose, giving me a splendid show of her ass or her heavy breasts swinging right in front of my face.
She had always been skinny, which was unusual for girls as short as she was.
But after she hit her peak height, the rest of her seemed to start filling out just right.
Dad was grunting as he thrust himself into mom, and mom moaned and whimpered. She was so hot sitting on the counter, with her legs spread and her breasts pushed out as she leaned back on her hands. My mind went kind of fuzzy and I was suddenly very horny.
I just froze, and felt like I wasn't even really there. She stopped laughing and saw me staring at her body. I instinctively began stroking myself, and Kat seemed very pleased.But when Kate finally filled out and grew real breasts, she seemed to strut around the house like she wanted to show off to everyone.That had the usual effect on me, and I found myself having straining erections everytime she bent over or leaned close to me.She wasn't what I would call thick by any means, in fact she was very toned and athletic.And her constant nudity had allowed me to appreciate her sculpted curves as well.But I think that when Kat and I were "of age", they felt that they could display more of their sexuality to us.