Robbie came running into my bedroom in her see thru dolly nightie as I was just getting out of bed with a hard on this morning. Robbie is my older sister by 12 months and a dream girl to my friends. She saw my hard cock and wanted a big favour later this afternoon.

Robbie asked “Did you enter the Draw at school and who did you get Peter?”

I replied “Yes and none, apparently not enough females entered.”

Robbie replied “Well I did win a boy and do you want revenge?”

I replied “What do you mean?”

Robbie replied “I drew dick head bully Bruce, so if you agree and with mum and dad away, you fuck my cunt and arse and I’ll clean you up with my mouth before I go to the party and be the play toy of Bruce, interested?”

I smiled at the thought, Robbie smiled back in happiness, I replied “Yes why not.”

Robbie replied “I told him he has to eat me out before his cock entered my pussy and he sort of agreed, I did say ‘no eating no holes’. So he nodded. As I was saying this I did think of you and his bulling of you. I have to be at the party at 7, so we have dinner at five thirty, fucking sex at 6 and then you drop me off at the party, I’ll go straight to him and force him to eat me with your spunk.”

Not for a long time have I hugged my sister but now I put my arms around her and kissed her on the lips, saying “Thanks, I really mean many thanks sister.” She kissed me back, we walked together to get some breakfast, me in just shorts and a hard cock, Robbie in just her dolly nightie with nothing else on. We sat together having breakfast just chatting.

We had a nothing day at home but kept looking at each other, as we did not change our clothes. At 4.30 Robbie had a shower and came out with her towelling dressing gown flashing to me she was naked underneath. I smiled. We prepared ourselves a pizza for dinner. At six Robbie held my hand and pulled me to her bedroom.

I quickly got hard again as she removed the towelling gown and laid on her bed with legs wide open. I dropped to my knees and licked her pussy and arsehole, drilling both with my tongue. After she came I flip her over and pushed my cock slowly into her juicy pussy and put my thumb into her arsehole. Man I never ever thought I would have this opportunity to screw my sister but it’s happening. It did not take me long to shoot my first cum as I was hot to trot all day. I filled her pussy and it overflowed onto her bed. Still hard, I pushed my cock inside her arsehole and it slipped in quite easily as she had oiled herself. Man I did not want to ever leave her sexy body. I pump away as she was moaning in pleasure and fucking back on me, It did not take too long for me to cum again and fill her arse. After a few minutes I pulled out and Robbie turned around and pounced on my cock cleaning me up from her arsehole. I was in heaven as she is a brilliant cocksucker.

After cleaning me up we dressed for the party, Robbie just put on a slutty dress with no bra, just underpants to keep the juices inside her. I dressed in shorts and t-shirt just to drive her to the party.