Your sister your urinal

You think for a moment one of your biggest kinks that until now you thought you would never fulfill. But all has changed and now you feel everything is possible.

"I want you to be my urinal."

Andrea was in schok, she didnt expected anything not even remote like this. But your mom instead was very calm, and smilling, she seems to like the idea.

"What do you mean by an urinal, i dont understand."

"He just wants you to drink his piss."

"Yes sis, i have always wanted to piss in a girl's mouth, i think if i do it it will help me to cum afterwards."

"But"...she replied ashamed..."it's piss, it's so gross".

Your mom grab your sister's head and then very serously she stared to her eyes, "Andrea, this is for your brother, he needs it", she was so embarrassed that try to look down "i know that", then your mother grab her more firmly and Andrea couldnt avoid to look at your mother "Andrea, look at me!". Both women make eyes contact "I want you to look at me eyes and say 'I will be an urinal for my little brother's sake'".

"Ok mom, i will do it because he needs it, i will be my little brother's urinal".

After that your sister kneel at your feet, she look ashamed but with very resolution "Ok bro, this is what you want isnt it? I am ready to be your urinal. Go on, pee in my mouth, i promise to drink it all"