My sweet sister Part 4(b) ( to be conclude in part 4(c)

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The whole purpose of telling the story of my friend at that particular moment to my Didi was to convey Didi indirectly my desire to do the same activity with her. She must have understood my trick , still I could not have directly conveyed my desire to her anyway. After hearing this filthy story , I think she also generated an interest in it and she gave me a tight hug along with a kiss on my cheek indirectly appreciating the story and indicating her interest in it. That was exactly I was waiting for. With out wasting any time I mounted on her in “69” position thrusting my erect penis in to her soft lovely mouth. I slightly parted her thighs and first gave simple kisses to the pussy and surrounding areas. At that time she was busy in licking softly my prince. As a next step very carefully and gently I parted the petals of her pussy and started licking it including the cunt area and also the pussy hole area , at the same time giving reciprocating motions of my penis in her mouth. Some time I was feeling mild pain ( but pleasant) when her teeth were unknowingly come into contact with the outer face of my penis. This activity we enjoyed fully for a good duration and we were exhausted. Then Didi told me “ Ok darling I think we had enough for today and we can carry on tomorrow”. So I got up and lay side by side with her. Then whispered to her “ I have a request , we should sleep in this naked condition only for the time being. Who ever get up early should wake up the other and both should dress up then only” She told that it was not a bad idea. She added “ But one important thing . What ever happened today and will happen in future should remain a big secret between us only. In no circumstances it should be known to anybody else. For example , even by mistake don’t reveal this to your friend who revealed to you the ‘69’ episode of his parents ,Ok ?” I promised her nothing of that sort will happen. So in stark naked condition we slept hugging each other and sharing each other the warmth of the body and before dawn , dressed up and slept till the morning.