I realized we haven't said anything since we stared. I managed to blurt out just one thing, "Yeah Baby. Cum for me!" in my best fem sexy voice I can...muster.Not sure if that was the trigger but his cock let loose a gob of pre-cum over the back of my hands. At that very instant, I made a decision. I squeezed one hand tightly on his thick cock shaft and lightly grabbed his cock head with my other hand and started pumping really fast. He rolled flat on his back and started raising his hips off. ' I whispered to William '...stop or they will hear us...' William answered '... think about it. They find us back here, you with your pants down. I'll just tell them you brought me back here. After all it's your books out there under the desk not mine...' William then took his right hand and slid it between us and undid his zipper exposing his rock hard organ and rubbed it up and down my butt crack. I could feel the line of pre cum that was already leaking form his rubbery hard dick head. Once. "Because she gives me a running commentary on it with pics and videos. I think she does it to wind me up but I kind of like it. Here, I'll show you."Sarah unlocked her phone and opened up WhatsApp. She flicked through a series of messages, pics and videos of her sister either being fucked or sucking cock or posing nude next to her current male conquest. The accompanying message provided a sarcastic commentary on the guys she was fucking. 'Useless', 'dickhead', 'thick, but a good fuck'. Sam had. Then the lady was stopped by the voice of her husband. He has holding a bowl which had ice cream in it and I saw a camera around his neck.Now I understood the scenario. Then the husband applied some ice on my balls and started taking pic of that( I was feeling the coldness of ice). Then he asked his wife to suck me again. She was fast enough to suck it. In the mean time he applied more ice on my semi hard dick. She was eating the ice cream of my dick as a hungry bitch.It continued for few.