My brother in law and my younger sister.

My brother in law ( my younger sister's husband) was hospitalized for some minor disease.He became very weak and so while discharging doctor advised him tontake bedrest for one month. After their marriage, brother in lawy's elder sister had secretly told my younger sister that her husband needed every day fucking. My younger sister replied that, her husband also needed fuvking at least on alternate days. I had learned these from my wife whom my sister had told. This was their fucking history. After a couple of days after hid discharge, my youngersister told me secretly." My darling brther, I want to tell you something. Yesterday my husband told me that he can not control his sexusl urge. Since he was very week he can't directly indulge in it.So he requested me to show him somebody fuvking me. Can you do it ? " Before our marriage m I had many times peeped while she was bathing ,and enjoyed. But I never fucked her. So I asked her ok your husband had requested to show him somebody fucking you.But will he agree me fucking you ,afterall I am your brother. Sister replied " don't worry, I had hinted it to my husband and he has no objection. : Then I asked her " had you after your marriage anytime told your husband about peeping of mine during your bathing " Sister instantly replied " never" . I again asked her" that is okay, but what will happen if your grown up children - one son and two daughters-- learned about your husband's rare request and that we both have agreed that ?" Sister replied " don't worry, it will be kept asba secret among we three only.So next night we three after dinner reached their quite big bedroom. We kept another bed and mattress a little away from their cot and bed. From the face of my brother in law , I knew that he was eagerly waiting for our naughty activities.Then I tod the sister " today being first day ( we have one full month at our disposal) we will engage in fucking in the style of yours. So please guide since I didn't know how you both were fucking. On subsequent days we will do in myown style." Sister discussed with her husband and he agreed. Now she removed my shirt, banyan and lungi and I became only with my underwear. She asked me to remove her dress one by one. So first I removed her saree, blouse and bra andshe became one with her underskirt ( she never wore lingerie when she was at home) . I was seeing her boobs after a long time ( at least after fifteen years). She was then aged fifteen then and me twenty. Now she is thirty and me forty. After seeing her quite big boobs, my cock under my underwear wear had an erection. She and her husband looked at it and enjoyed. Now she removed my underwear making me fully naked. Then I removed her underskirt making her fully naked. Oh! my God, what a figure. I felt jealousy towards my brother in law. Seeing her full naked body my huge cock started dancing.She lowered my mouth to her pussy. I started licking it for full fifteen minutes. Then she turned away from facing her buttocks towards me. My right palm wandered all over her ass cheeks.then I gently spread her ass Crack and licked her area between her ass hole and bottom tip of her pussy. Her clitoris also was bitten by me gently. These operations lasted for fifteen minutes. Then I lifted her and placed her on the bed.I spread her thighs and inserted my huge fully erected cock intonher pussyhole,made toband fro motions forvabout twenty minutes until it cummed into her pussy. Meanwhile I saw brother in law getting aroused and his right palm under the bedshhet moving towards his unerected cock. He enjoyed our activities and at the same time sister and me enjoyed his action. We cleaned ourselves and they slept there and I went grund for and dlept there.