half siblings with intense sexual attraction

I have never had a problem with allowing myself to be honest about this topic (especially to my step-brother Josh). I am the product of an affair and my father and his family lived 3 blocks away from my grandmother's home where I grew up. Fastforward to 2018 when I saw him for the first time since we were children. I knew the very moment he put his arms around me when we hugged that it was going to be sexual one day. Making sure to have the most "come ###$ me eyes" I sent a pic for him to use with my contact info. in his phone.
A year later, I made it known that I wanted him inside me. We had the most intense sex and while this was happening, we made sure to express to each other how intense the attraction to the other was. That sealed the deal. I craved his touch, I craved his desire to want to touch me.
Here we are in 2024 and even though our lives are not shared the way we would like for them to be that strong sexual desire is still there. I can't even fathom the idea of him with another woman. And it makes him frustrated that I am married. But whenever life allows us to be intimate we don't hesitate and it's still there but getting more and more intense. I do not feel any type of way about myself for having these desires, and neither does he.