Sister-in-law watches my wife suck me and then shows me her skills

So it’s Christmas Eve, in-laws are at our place, everybody’s finally passed out downstairs around midnight. Me and my wife sneak into the bedroom.

She drops to her knees right there by the bed, her green eyes looking up at me while she starts sucking me off. Her big DD tits are basically falling out of that tank top, bouncing every time her head moves. She’s going at it hard, sloppy as fuck. I grab her hair and push her down deeper every couple strokes.

Then I hear someone in the hall, quiet footsteps. My sister-in-law stops right in the doorway (the door was cracked a bit). She’s tall, skinny, brunette hair still looking perfect even though it’s late. Just wearing some thin sleep shirt and these tiny shorts that are basically glued to her bubble butt. Her tits are smaller than my wife’s, but real soft and perky, nipples poking right through the shirt. She’s tighter all around, always looks put together.

She sees what’s going on—her sister on her knees with my dick in her mouth, totally clueless—and she just freezes. But she doesn’t walk away. Leans on the doorframe and watches.

I look right at her. My dick gets even harder in my wife’s mouth just seeing that ass in those shorts. I push my wife down more and go “yeah keep going” kinda low. Wife moans around me, thinks it’s all for her, starts sucking even harder.

Sister-in-law gives this little smirk, like she knows she shouldn’t but she’s into it. She pulls her shirt up slow, shows her stomach, then those soft tits, starts playing with one nipple. Turns a little, sticks her ass out more, then slides the shorts down her legs and kicks them off. No panties. She leans back on the frame, spreads her legs a bit, starts rubbing herself while she watches.

I’m thrusting into my wife’s mouth now, staring at my sister-in-law the whole time. Tell my wife “deeper” and she tries, gags a little but keeps going. Sister-in-law’s fingers are going faster, she’s breathing harder, thighs shaking. She pinches her nipple, bites her lip so she doesn’t make noise, then cums right there, all quiet but you can tell. Gives me one last look and disappears down the hall.

Next day is all the usual Christmas shit—presents, food, everybody loud. My sister-in-law keeps finding excuses to brush past me, that ass looking crazy in black leggings and getting me super hard as she rubs against my cock.

Later in the afternoon my wife knocks out on the couch with our niece, rest of her family is out grabbing food, house is finally dead quiet. I’m walking down the hall and my sister-in-law’s just standing by her guest room door. Black sweater, those same tight leggings hugging her ass.

She looks both ways quick, nods me in, shuts the door quiet and locks it. Drops straight to her knees on the rug, pulls my sweats down, grabs my dick—already rock hard.

“My turn,” she says real low, looks up once.

Then just takes me all the way down, no messing around. Her lips are softer and fuller than my wife’s. Her warm mouth and tongue feel amazing as she takes me deep every time no problem. One hand on the bottom, other on my balls, just right. Way cleaner and tighter than my wife, total control.

I grab her hair and groan. She keeps going, twisting her head a bit, that ass shaking behind her while she bobs.

I start fucking her mouth and tell her I’m close. She just hums and keeps sucking. I go deep and cum right down her throat. She swallows it all, slow, doesn’t miss a drop, milks me dry. Pulls off, licks the tip quick, stands up, fixes her sweater and hair like nothing happened.

Walks past me out the door, ass swaying.

Best Christmas ever.