My SIL has become my new sex slave.

So I'm 31M married, My wife 30 and a son who is 2 living in Delhi. Last month my wife had to go on a temporary posting for work in Jaipur for 3 months which left me and my son alone. So she suggested that my SIL who is 23 and has a remote job could stay with me and my son to look after him when I'm at my work.

Now me and my SIL have been very close as she used to tell me about her boyfriends and used to ask me advice regarding her relationships. So one day she came to me and said that she really needed to talk to me and we should have a few drinks and chat after my son goes to sleep to which I said alright.

2-3 hours after we sat down drinking and talking I noticed that she went to the washroom and came out in a really slutty night suit without any bra on. Now let me remind you this happened after almost 20 days my wife had left and I last had sex. I got a little uncomfortable seeing her big boobs (36C) and tried to not look at them. She was still talking about her new boyfriend and how he is not sexually active with her despite her being open to almost anything.

After hearing about her sex life and looking at how hot and slutty she was looking I couldn't control myself and I got a solid hard-on which was little visible from my pants. That's when she also noticed it and just grabbed my dick in her hands.

I tried to stop her at first but when I looked at her sitting next to me in that slutty night suit with her hand on my dick and all the buzz from the drinks that we had I gave in and she started to rub her hand on my dick through my pants. She then told me that until my wife comes back we could have a little fun here and there and then I just lost it and pulled my pants down and kissed her. She pushed me back, got down on her knees and started sucking my dick. She even told me to hold her hair tightly and push my dick inside her mouth. She kept blowing me for a few minutes like this and then came and sat on top of me. Her big boobs were infront of my face which I immediately started sucking and biting on her nipples. We had sex for a good 15 minutes and when I was about to cum, I told her that I'm Cumming and she immediately stopped and asked me that where would I like to cum, I said I want to cum in your mouth and I want you to swallow it as my wife doesn't let me cum in her mouth. She happily obliged and again started to suck and lick my dick. Just after a few seconds I came so hard that I filled her mouth with my cum and she tried to swallow it all but some dripped down on her boobs. After this she went to the bathroom to clean herself and when she came back she told me that she'll be happy to fulfill all my sexual desires without any objections until my wife comes back.

Since that night she has been blowing, fucking me in whatever way I want and she is still open to anything that I want.