(M4F) Casual free use relationship between roommates. It's not cheating if we just treat echoter like toys.
A normal day in our apartment is when you walk around the house only wearing a t-shirt, being too lazy to even put on panties. I sit on the couch bored out of my mind when you come in, so I whip my cock out without saying a word and you know what to do. You get on your knees and start gagging on my cock like a toy. As my girlfriend calls I answer without hesitation. We don't need to tell our partners about this system we gave in our own house, it's just masturbating after all.
Casual sex is a must here, no feelings between us. Our relationship is purely sexual, and to not be bored when alone together.