During sex, horny wife asked me if I imagined our teenager

Anybody else suffer as much as I am having a sexy teen in the house? I'll never DO anything - other than fuck my wife like crazy - but it feels so naughty, bad and enjoyable to look at her!
My wife and teenage daughter are two very attractive females!
This past summer our daughter began experimenting with wearing a thong in our pool.....she said all her friends are wearing suits with skimpy bottoms and she didn't want to be thought of as being a prude, or old-fashioned.
So far - blessedly - she has only worn this one-piece suit with the thong up her rear in our pool - without guests! As a red-head, she looks devastatingly alluring in that black suit with all that young & very pale flesh of hips, thighs and bottom on display! Her young butt is just maybe one size too big for her figure - but dear goodness it looks like it would be SO nice to fondle - or bury your face into!
I can deal with her antics around the pool at mid-day - my lust and bad thoughts are drained off by the evening! OK - maybe my wife will get fucked!
But - now she is experimenting with some bits from that national lingerie shop.
Last night she came down to join us for a movie in the living room. Being a kid - she has always liked splaying herself on the carpet with her popcorn - chin in her hands - watching the television. When I glanced down at her - I found myself looking straight up between those lovely teenage legs at her crotch in a pair of pale pink 'boy-shorts', she calls them. "Cheeky" I call them!
Damn - that little crease area of the back of her thigh, just bellow the swell of her pale butt cheek - is one of my weak points. I just want to lick my wife when her short-shorts give me glimpses of her butt in that area!
Now - my teen is casually splayed down there, feet up and waving about, crotch on full display, her panties tightly pulled into her young pussy...and those sweet very ripe cheeks of her bottom are flexing and 'moving' as she swings her feet around. Oh, goodness - when she flexes those lovely full cheeks!
I am staring like a rabid dog at my daughter's crotch! WTH! - imagining her cunt and pubes beneath that slit of fabric! My daughter, for Pete's sake!
After 1/2 an hour I excused myself - and went to take the dog out for the evening walk.
When I came back my wife and daughter had opened the wine and both were sitting cross=legged on the carpet....laughing like kids about something. But - ah geez, my daughter is rolling her butt over and around, legs spread innocently - and I focused straight into all that barely covered female area below her nighty!
My wife called my name - a little too loudly - and I saw that she had seen exactly where I was looking - and how much I was enjoying our daughter's body! Hell - her crotch and ass!
She didn't seem angry - just pleased with herself for "catching" me... eye-groping our pretty daughter's young pussy!
Back to the title of this post:
Yeah - an hour later, as I was pounding my wife's lovely hips hard down into our bed, squeezing her ass cheeks viscously and grunting my way towards a big cum in her tight pussy .....she saw that my eyes were closed and put me over the edge when she whispered in my ear, "you're thinking about our teenager's crotch, aren't you?!"
Ah man - I came so hard!
"Yes!"
"It's OK, honey - ah damn! catching you being so naughty, I'm cumming too!"
"She is a sexy little thing, and you're just a healthy guy. I'll have a talk with her, so maybe she doesn't torment you too much!"
Yeah, well that is probably for the best.......
but damn, I'm ashamed to admit that I hope my tipsy wife forgets all about having that talk with her!