I F18 gave my friend a blowjob while he was sleeping in bed next to his sleeping girlfriend

I'm an 18F with a 23M friend who is in an open relationship with a 21F. Because he's in an open relationship, I'd been fucking this friend for quite some time. He asked me last night if I wanted to give him a blowjob while his girlfriend slept next to him. The concept piqued my interest and turned me on.

Around 11 p.m., he asked if I was available to come over because she was sleeping. He told me to be very quiet and that the door was unlocked. When I arrived at their house, I quietly opened the door and crept up the stairs to their room. His girlfriend must have been a heavy sleeper because she didn't move an inch. I crept over to his side of the bed, and he rolled over and lifted up the blanket, his hard cock protruding over the edge of the bed.

I went to town using the dim light on my phone to see. He pretended to sleep so as not to wake his girlfriend. He never said how I was doing, but I could feel him pulsing and throbbing in my mouth, so I'm sure it felt good. I felt a warm, thick load of cum explode into my mouth within 5 minutes. I quietly left after swallowing his load. I have yet to hear from him, but I really want to do it again.