Giving my boyfriend's best friend a BJ!

So before everyone goes crazy thinking I was cheating, I wasn't! My boyfriend told me that his best friend had never had good head. This was pretty sad to hear knowing how many people he has been with. The three of us are all really close so it wasn't like I didn't know him. My boyfriend asked me to give him good head, and after some convincing I finally agreed. My boyfriend couldn't look me in the eyes after and made me drink mouthwash. Anyone have any thoughts on this??