Cheating with clumsy friend from the girlfriend

The boyfriend of my girlfriend added the shower faucet to me today, when he wanted to show me that he got wet the clumsy man. I told him to take off his clothes so I can put them in the dryer. he takes off his t-shirt and his pants, didn't know that he wasn't wearing any panties. When he stood there naked, I got a little horny and I didn't care that he was the friend of the girlfriend, I just wanted to fuck. Ouch.