Absolutely no,it not something you should even think of doing.
It's totally wrong to want to have an affair with your siblings,i mean that's an evil thought for real.
How can someone be having emotional and sexual feelings for his/her siblings.
I know there are many cases like that and i have seen some few ones myself but it's really irritating and doesn't sit well at all in any society.
Infact in most religious society it's a taboo and such person can be endangering his/ her life if caught.
My advice is don't even go there, you have to remove such thought from your mind quickly before it even settles in your heart.
What kind of sick question is this?!
BIG NO. Damn, it's disgusting and highly irritating. I would rather not have an affair at all than have an affair with my sibling. It's a taboo, I don't know if there's an English word for that. But having an affair with my sibling is a no no for me. There are several other guys I could easily have an affair with, but definitely not my sibling.
Unfortunately, I only have a sibling of the same sex.
Since I'm not a homosexual, I have never struggled with such dilemma.
Peace is a state of the mind. If nothing troubles or bothers you mind, it simply means that you're at peace. The easiest way to find peace during the day is to do things that you love, be yourself and be proud of who you are. Try to always be thankful for life, your loved ones and the little achievements that you've had and take life and each day a moment at a time and your day will always be peaceful.
Guide your heart and let nothing bother you and you mind and life will always be at peace
If no pregnancy is involved, it's probably somewhat acceptable.
Just keep it between yourselves and enjoy.
In fact many Korean and Japanese dramas are based on incest among sibling.
This is totally a trolling question, right...?
(Insert facepalm here).