Part One: Living with My [M] Sister-In-Law [F]

I’ve been married for just over two years to a partner who is a LLF (low lobido female). We manage okay, but it has always been a pain point. This past year, her older sister went through a bad divorce and moved in with us to help get back on her feet.

Both my wife and sister (we’ll call Sarah) are similar in body shape, pale skin, extremely petit/athletic body with perky A-cups, wide hips, and thick ass. Living together with her sister was rather uneventful for the first few months, until my wife began to share that Sarah had expressed frustration with finding someone new and was sexually agrivated.

My wife has always hated Sarah’s partners and expressed that she wished she could “find someone like me for her.” Jokingly, I said Sarah could always use me however she likes. My wife shocked me by saying “as long as I’m not around, go for it….” Later that evening, my wife made a joke to Sarah during dinner about them being “sister wives” and expressed a similar sentiment to Sarah saying, “feel free to take full advantage of him, if the feeling strikes.” Sarah laughed and then looked at me said “I’ll keep that in mind.”

The first opportunity came about three days later as Sarah and I were working from home alone. Sarah is extremly shy and most of our interactions can be measured in words and not sentences. Still, she would flirt in subtle ways like working out in a sports bra and tight shorts in the adjoining room as we were home together or walking into her bathroom for a shower in nothing but a thong, leaving the bathroom door wide open as she was showering.

I had just come home from a run and was headed into the shower when I heard Sarah’s shower start up and saw the door open. Our water pressure doesn’t allow for both showers to be on, so I decided to make a move and peaked into the bathroom to say “you mind if I jump in to rinse off?” Sarah slowly looked around the shower curtain and grinned saying “sure, I could use some help.”

As I stepped in, we both stood nervously for a moment examining eachother’s bodies. I immediatly offered to wash Sarah and begin to lather soap in my hands and massage her shoulders, neck, and tiny breasts, feeling her now-hard nipples between my fingers. I dropped to my knees and ran my hands down her stomach, tracing her pelvic bone and grazing her pussy lips with my hands as I washed in between her legs. Asking her to turn around, I made my way up and down her legs. Then started massaging her plump ass and thighs, gently fingering her pussy in the process.

She let out a slight moan and I asked her to lean forward and spread her legs. I began to gently nibble at her pussy lips, teasing her vagina before eventually sliding my tongue deep inside her. Sarah became more vocal than I could have ever imagined, practically screaming with every thrust. I worked my way up to her anus, rimming the outside before teasing further with my tongue and fingers.

Sarah caught her breath to turn around and began aggresively washing my chest, diggeing her nails into my skin. Her hands slid down my torso and onto my cock, she began to massage my balls with one hand and stroke my shaft with the other. After rinsing the soap off my body, she immediatly took my cock in her mouth deeper than I’ve ever experienced, gagging and choaking in the process. I held her head and began to fuck her throat. Within moments I mumbled to let her know I was close, she suprisingly grabbed my ass and took me in deeper as my cock exploded cum down her throat.

We quietly towled off and Sarah jokingly said she now had an “open door policy” on showering together whenever her sister was gone.

Source: reddit.com/r/gonewildstories/comments/pa5t6n/part_one_living_with_my_m_sisterinlaw_f