Your sister-in-law

Standing up, dick in your hand, posed to spurt into the toilet bowl, the door opens to reveal your sister-in-law.

She stands there in a tiny satin in lace nightgown. It ends halfway up her thighs. The spaghetti straps look like they’re about to snap from the weight of holding up her tits hanging low in the cups. Her eyes see you. She’s about to apologize for barging it. She sees what you’re doing.

Her jaw drops.

You wait for the scream.

It doesn’t come. She steps into the bathroom and closes the door behind her. She leans against it. Her eyes never leave your hand on your cock.

She locks the door. A little smile creeps on her face. “You can continue. I’ve never seen a guy do it before.”

Oh fuck. Your brother’s wife is a tiny little nightie is asking to watch you stroke. Talk about pressure. Your mouth dries. You can't move your hand. You’re frozen, staring in disbelief.

“Sorry. Did I interrupt your thought? What were you thinking about? Can I help you get it back?”

Oh my god. This isn’t happening.

Your voice is weak. You lie. No way are you going to admit you thought about your naked sisters. “I was thinking of you.”

She smiles, “Oh really? Why me?”

“You’re so hot.”

“I am? What’s hot about me?”

Without thinking, you start stroking again. What’s she’s doing it working.

“Your boobs.”

“What are my boobs are hot?”

“They’re so big. I didn’t expect you to have such big boobs.”

“I thought I hid them well. How did you know?” She cups them through her nightie and lifts them. Sweet Jesus, thank you, her nipples poke against the satin.

You don’t rat on your brother and his bikini pic. You say, “The poker game. Your bra can’t hide how big they are.”

“You must’ve been so disappointed that I won.”

You’re jacking your cock so fast. “I was. I wanted to see your tits so badly.”

The wet smacking of the lotion on the ridge of your tip fills the silence.

Your sister-in-law puts a thumb under her taunt spaghetti strap. “Do you still want to see them?”

“Oh god yes.”