Secretly watching my sister-in-law's underwear

Caught sight of my sister-in-law's underwear, couldn't resist. Frisked around, got caught. Nervous wank sesh ensued, alone in the house. Tempting lingerie, arousing sight. Secretly satisfying myself, hoping not to get caught.

I've been harboring a naughty secret for quite some time now. You see, I have this irresistible urge to sneak a peek at my sister-in-law's intimate apparel whenever I'm over at my brother's place. It's a thrill that I can't seem to shake off. The forbidden allure of these delicate items, especially her bra and panties, is just too much to resist. I find myself drawn to the sight of them, tucked away in her dresser, each time I'm there. Of course, I've got to be extra careful not to get caught. The thought of my wife finding out is a terrifying prospect. But the risk only adds to the excitement. I find myself getting aroused just by the thought of it, and I can't help but take it a step further. Alone in the house, I find myself unable to resist the urge to wank and jerk to these forbidden pleasures. It's a secret sin that I hope to keep hidden for as long as I can.