I come in with my hair still wet from swimming and lay on the bed next to you. Your girlfriend confided in me that you won't show her how you like to make yourself cum! Well, being the friend that I am to both of you, I'm going to show her for you. I lay next to you and tease your body and nipples while stroking your hard cock off camera until you cum for me(and her!). It's the least I could do ;)