Can't stop

So long as she is over 16 don’t stop. Smell her intoxicating cunt and arse smell. Know exactly what it would be like for someone who goes down on her. What they will smell and how messy her cunt is. Be her brother and get excited on the thought that she has no idea you know what her pussy smells like and if it’s creamy and leaves goo discharge in her underwear

How old is your sister..

Just enjoy it, you don't need help.