Your other sister Erin

You look up from Mary's face towards the door to see your other sister leaning against the doorframe. She was covered in a slight sheen of sweat from her morning jog. Erin looked very different from most of the family. Unlike you and Mary she was not an IVF baby. Your moms adopted her from a family in China when she was a baby. While you considered her your sister in every way that counted, she stood out a bit in family photos.

Her long black hair was pulled up in a messy ponytail for her run. Erin took great care in her body, working out constantly and it showed. Despite being barely a hair over 5 feet her body was tight as a drum. It left her with perky tits and abs that showed when she wore something that showed off her belly. Such as her current outfit of a sports bra and tight running shorts.

Your cock hardened at the sight. Or maybe it was Mary's mouth working over every crevice of your cock clean with her tongue. You place a hand on her head to keep her from getting too enthusiastic. It was nice just to feel her warm mouth all over you.

"Hey Erin," You greeted with a slight grunt when your sister's tongue hit something sensitive on the underside of your cock. "You have class today?"

Erin was older than you and Mary by a few years. She was already finishing up her degree and often had days without any class.

"Yeah, but only in the afternoon. Why?"

"Oh you know, in case I want to fuck you."

"Ugh," she groaned. "Is that all you think about these days?"

"Yeah, mostly."

Erin just rolled her eyes before pushing off the door and heading towards the bathroom. You pull Mary off your cock and followed after. She glanced back at you but didn't stop you from entering the bathroom after. She turned the shower on and waited for the water to heat up before opening the glass door and stepping inside. As you walk in with her she barely has time to turn her head before you kiss her hard on the mouth and run a hand along her tight ass.

You stand there making out under the spray for a moment feeling her body against yours before you slide a hand down to her pussy and give it a few rubs. Erin was smooth as silk down there, a surprise the first time you fucked but as she explained, it was more comfortable when she wore tight clothes to work out.

Involuntarily, she moaned into your mouth before pulling back.

"In the shower John?"

"Yeah, I want to try it out."

"We don't have condoms in here," she told you even as you turned her around. Given how much shorter she was it was hard to fuck her from the front if you were standing.

"From now on I'm fucking you all raw," you informed her. She groaned again, either from the news of her future getting raw-dogged by her brother from now on or because your cock slid deep inside her pussy on your first thrust. Maybe a mix of both.

As usual her pussy was as tight as the rest of her body. Frankly it amazed you that she was even able to take your entire cock but she somehow managed. The muscles of her cunt seemed to work double time compared to the rest of the women in your family. Every thrust you made was met with a tight squeeze in answer and it seemed to hug every inch of you as you pulled out.

The shower sprayed against your bodies as you pounded into your sister's cunt, feeling the exquisite heat inside her burning hotter than the water falling on you. It did not take long for your cum to start to bubble up inside your balls. Despite all the practice Erin's pussy always did its best to drain your load out in record time.

"Oh fuck," you muttered against her back as you thrust as deep as you could. "God damn Erin, your pussy is next level."

"Gross, John," She said even as a moan followed her words. "Ahh, fuck that's a lot."

She wasn't wrong, you felt as if you were cumming buckets as her pussy contracted and squeezed as if it wanted to get every drop out of you. It took only a few moments but it felt much longer. With a gasping breath, you finally finished and pulled your cock out.

It was odd then after you finished up fucking to actually shower with your sister. The shower was not quite big enough to fit two people easily but you made it work, scrubbing down quickly. Erin took longer, trying to scrape your cum out of her pussy before she mostly just gave up and washed as best she could.

"I'm going to be dripping all morning," she said as she glared at you.

You didn't even bother to look sheepish at her words. If you had your way every pussy in the house would be dripping cum 24/7. You might even have to try to make that work in the next few weeks. As you finished drying off your mother's voice called up from downstairs.

"Erin, John, breakfast! Hurry up in there!"

You quickly hand Erin the towel and head to the kitchen to eat. Also to get breakfast.