A wife is not as good as a concubine, and a concubine is not as good as a stolen affair.

It was late at night, but I couldn't sleep. I tossed and turned for a long time, finally gritting my teeth, throwing off the covers, and with a pounding heart, tiptoed to her door.
She's my sister-in-law. She's never been a good student, nothing like my wife. She went to a vocational school after junior high and is currently unemployed. She has a boyfriend who works on construction projects and is doing well; they're planning to get married next year.
After my wife finished her maternity leave, she asked my sister-in-law to help look after the baby. We take care of him at night, and he's with my sister-in-law during the day while I'm at work. My son is very attached to my wife. Every time I leave for work, I carry him first, my wife sneaks away and waits for me downstairs, and then I hand him over to my sister-in-law. My sister-in-law has incredibly large breasts, even bigger than my wife's, who is breastfeeding. I really don't know how her boyfriend developed them! When I put him in her arms, my hands always end up touching them. At first, my sister-in-law always stood to pick up the child, but after a while she got lazy and started sitting on the sofa. I had to lean forward to hand the child to her, and several times my weight shifted, and my hand pressed against her breast, but she didn't seem to mind. So gradually, I started to linger a little longer, and even move around a bit. My sister-in-law would just blush and never say anything. I think she might be thinking about it too, since she hadn't seen her boyfriend for over four months since coming to my house.
It's winter now, and the heating is on really high. Even after taking off my coat, it's still a bit warm, so my wife tells me to take off my pants and just wear my thermal underwear. My wife and sister-in-law do the same; it's so hot, and they always roll up their sleeves high. But a few times when I was sitting there, I saw my sister-in-law secretly peeking at the opening in my thermal underwear. Looks like she's a bit of a flirt! Often when I'm rocking my son, my wife's younger sister comes back to my side, reaching out her arms to coax him to be held. She deliberately gets close to me, her arm brushing against mine, gently rubbing against me as I sway. It's ticklish, and I can't help but take advantage of this close proximity to peek at her chest, which makes me hard. Then she turns around to carry my son on her back, and when I put him on her back, I always rub against her bottom a couple of times. Actually, I know there are many things we can't do, but this little bit of ambiguity is fine. I believe my wife's younger sister understands without me saying a word.
My son sleeps with his arms outstretched like a starfish, taking up more space than an adult, so my wife asks me to sleep in another room. She'll have to work harder at night, and I can spend more time with the child after work so she can get more sleep. There are three bedrooms in the house. Lately, my son has been very fussy at night, and my wife hasn't been sleeping well. We haven't had any intimacy for over a week.
My heart pounded as I stood at the door. Gritting my teeth, I gently gripped the doorknob and turned it. The door opened, and I moved to the bedside by feel, listening carefully to make sure my sister-in-law was asleep. Using the light from my phone screen, I saw she was covered with a towel, lying on her back. Relieved, I gently lifted a corner of the towel, reached inside, and turned on my phone's flashlight. For the first time, I saw my sister-in-law's breasts up close, completely unobstructed. They were indeed large; I probably couldn't hold them in one hand! Her nipples, though tender, were somewhat dark, a reddish tinge. I couldn't resist licking one, but there was no reaction. I moved down a little; a pink pair of panties covered her there, so I couldn't see anything, but I could smell a slightly fishy, sour fragrance. I quickly became erect. Whatever, I thought, I might as well die! My mouth moved towards my sister-in-law's breasts. After just two kisses, I felt a tingling sensation travel from my toes to my tailbone, and I ejaculated right there, still wrapped in her panties! I was momentarily speechless, both amused and exasperated. Thankfully, my sister-in-law was asleep; if she had been awake, even if she wanted to, it wouldn't have been possible! I sheepishly left her room, feeling sticky and uncomfortable, and needed to change my underwear quickly.
After changing, I went back to my room and lay down, thinking it over. I felt I had been too impulsive today. Considering the ambiguous relationship between my sister-in-law and me, I knew I had opportunities when I was sober. Tomorrow, I'll start taking things step by step, and I must make my move!

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A wife is not as good as a concubine, and a concubine is not as good as a stolen affair.

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