Sibling incest

I have two half sisters.

One who shared naughty playtime with me when we were both children, under the guidance and encouragement of her mother. We never had intercourse, she was too small for me to get inside. That ended when my dad caught the three of us in the act. Haven't seen her since that day in 1979.

My other half sister was raised by our mother, and I saw her twice in person up until she was in her mid thirties. We reconnected so to speak and ended up having an affair for years. She ended it because of her jealousy that I was still fucking my wife. We're both single now... sort of dancing around getting together, but nothing has happened.

So far I’ve cum in my sisters mouth 3x and twice in her pussy.

I started doing this by giving her ride homes etc. ask questions about her friends to hook up with. Then “accidentally” send her a pick and see how she responds.

If you don't want to ruin a relationship then don't bring sex into it. Much higher risk of it all going wrong than going right

But you do want to ruin it by seducing her?