I worked my tongue all around and directly onto his tight bud for a few minutes as he kept his cheeks spread and groaned into the pillows. Time to see...how far his ex had taken the ass play. I stiffened up my tongue to a point and hit his pucker dead center. He was already kind of relaxed so when my tongue slipped in we were both surprised. But I still had other things in mind so I started really working the inside of his hole with my tongue. When he started pushing back on my face I knew he was. Carol's bathrobe fit her loosely and her big tits all but fell out, attracting her sister's excited gaze."You sure have big tits, Sis. And they're gorgeous, too, from what I can see anyway," Barbara murmured, licking her lips unconsciously."Thanks, Babs, so do you," Carol said with a blush, noticing how sexy her sister looked in her skimpy, tight bikini."God, but it's getting so hot. Summer's coming really early this year," Babs said, watching her sister closely."Yeah, I know. I'm getting hot. No one said a word as they looked at all four girls closely before turning toward another table.Yep they must have gotten the right angle to see that girl from here.As we watched, they headed the boy over to the table where the dark-skinned girl was still showing off her cum covered pussy. I don't know if she was high or that boy really sent her into space, but she didn't notice them until one of the teachers raised their voice to tell her to get up and come with them. She pointed out three. Before I could say anything, she gave me a paper with 5 points written. I started reading it:Rule no 1: Only when we both want ‘it’ we will do it. If any one of us is disinterested, the other partner cannot force it’.Rule no 2: We have to behave in a mother and son way in front of the society, your dad and relatives. We must not give anything away’.Rule no 3: Night is the perfect time for doing this as I have so many works in the day time.Rule no 4: You will treat me as a woman when I am in bed.