Few years back I had close experience. Not exactly a relationship, more like next level bromance.
I lived for almost 2 years with my best friend with which I grew up. He is a dominant guy, very self centered but a good dude overall. It came very natural to me to do most of the house work clean, laundry, cook some times. He was bringing girl often, we had separate bedrooms. You know living with a person which is close to you make you feel comfortable. Few times we got ...... and one of them I ended giving him head. I was chatting with trans person and he took interest. The person I was chatting wanted photos of us playing and one thing led to another. After that it was basically like open relationship for him. I woudl please him when he needed it and I was taking care of housework and other stuff. We also did few threesome with girl he was beinging so it was awesome experience for me.