My cousin Joanne and my sister Ann

It was christmas eve and everyone was round my house . Elders in the kitchen and children in the living room. The fire crackled as me my sister Ann and my cousin Joanne were talking and joking like we normally did every christmas. There was not really an age gap between us all, i was 15, my cousin 14 and my sister 16. As we were talking i couldn’t help but focus on Joannes tight nipples that poked out of her silk white top. I knew it was wrong but she and my sister were so hot. Both with long blonde hair, the only diffrence was my sister Ann’s more developed tits and her hight where as Joanne was quite small with small but firm tits. I was daydreaming thinking of them two rubbing each other with soap up and down each others thighs and licking each overs neck hearing only the faint sound of the elders laughing when i felt a pinch on my arm.
It was my sister,
‘wake up sleepy head’ she said gigeling.
‘Whats so funny’ i said laughing
They gigled some more and then pointed to my trousers. I had a huge hard on. It was boulging through my jeans. I blushed and tried to pretend it wasn’t there by pulling my t-shirt down over it.