I'm your sisters BFF and I'm just hanging out in her room with out her when you come in. You tell me you found my nudes online!! I'm so embarrassed and beg you not to tell anyone. You say you wont, but only if I get naked and hump a pillow. I do it reluctantly and then you pull out your cock! I'm kinda getting into it though. I suggest we make it more interesting so I instruct you to stroke your dick at the same pace that I hump the pillow. I hump fast, you stroke fast, I hump slowly, you jerk slow. Then I tell you to to stroke fast and we cum together! I show you the wet spot I left on the pillow and remind you to keep the nudes and this encounter a secret.