Ever since my brother found out I’m into trans women, we’ve been having sex together.
When I introduced my girlfriend to my family and my brother found out she was trans, he started getting very touchy-feely with me. One night we’ve shared a room since we were kids he came over to me dressed as a woman and took out his cock; I couldn't resist and sucked him off. When he saw that I had a bigger cock than him, he immediately wanted to put it in my ass probably to remind me who the big brother was and ever since then, whenever he dresses as a woman, we sleep together.