I will start by saying my young sister in law is really my step daughter, and now my niece is really my step grandchild / daughter. R was 2 when I met L and started dating. Their mom worked evenings, so we took R on all our dates. After about 4 months, I fucked L for the first time. We were at a friends house with a pool in the back yard. I was house sitting for them for 2 weeks taking care of their dog and such. Late afternoon, I put R down for a nap, and went in the pool, where L already was. We played this game, dive in, swim underwater through the other ones legs, coming up behind each other. L's turn, I slipped off my suit and stood on it, legs wide spread. She went in, and came up in front of me smiling. We got out, and went into the house for our first fuck.

Fast forward a few years, I'm now 29, L is 27, R is 13. I go by their mom's house, mid morning, summer, R is home alone. She wants to go swimming, apartment pool requires an adult for anyone under 18 to swim. Pool is in the rear, very privet, can't be seen by anyone unless you are inside the gated pool area. We are the only ones there, and R wants to play the underwater game. After about 5 times each, I take off my suit and standing on it, here she comes. Through my legs, up behind me, she starts spuddering. I slip my suit back on, and now my turn. I dive in, swim under water to R, and her bottoms are gone. I come up behind her, take her in my arms and spin her around. I give her her first adult kiss, and she whispers, let's go home.

As we enter the house, she takes my hand, I follow her to her bedroom, and lay her on the bed. Stripping off her top, I start kissing and sucking on those tiny little tits, just about the size of a small lemon. Slowly down her tummy, slip off the bottoms, and find her little bump, and suck that thing until R cums. Only took about 2 minutes. Now she is very wet, and I finger fuck her for another 10 to 12 minutes, adding a second finger after a while. Now is the time, I slide back up on her, and on the way up, take off my suit, and now slowly slide up inside her, popping her cherry as I go deep inside of her pussy.

Over the next few years, we fuck every chance we get. By the time she is 17, L has died of cancer, and the next month their mom is killed in a care accident. R now lives with me, and as I only have a one bedroom, we shair. After high school, R became with child, so we checked for to see about reletives to notify, and found that R was the daughter of L, not sister, so now my sister in law is my step daughter, and so as you can see my niece / stepdaughter has a baby, my daughter, my granddaughter / grate niece.