Sis And Law Vs Niece

My wife's older sister is 54 and absolutely fit. She's not quite a model, but she's petite and fit and obsessed with not aging so she can still fit in teenager's clothes without looking like a saggy old hag trying too hard. She mostly pulls it off except for a few outfits that she just should let go at this point...but the average mini skirt and tight pants and even bikinis she pulls off just fine, maybe if she'd just stay away from the booty shorts...that seems a little desperate...

Anyhow - lately she's been very aggressive with me, trying to get me to respond to her, and a few times pretty much said flat out hat we should have sex.

I'm torn between the yes and no...I've been hooking up with my niece...her daughter...since she was in high school. So she's my niece but not a blood relative, but still I get it's not the best situation. The daughter-niece is now 29 and we still get together a couple times a year even though she is also married and recently had her first child (not mine). She's hot, too, not in the way her mother is, but taller and a little thicker with a cute round butt where her mother is flat.

So I'm stuck to some degree. I'm already hiding a relationship with my niece from everyone. Even though the sister in law wants to hook up, I'd hate to ruin either my marriage, my side action with my niece, or both. Somehow the status quo works, and I'm tempted to take the risk to see what the sister in law is like in bed, something I've thought about for years.