After 5 minutes, we separated for breath. I started lifting her shirt and she helped me to remove mine. In a few minutes, we both became semi-nude. Sh... was in a black bra and floral panty. I was in my boxer. She could see the bulge on my boxer.Again I started kissing her lips hard and inserted my hand in her pussy. It was dripping with her love juice. I tasted it and gave her my finger and she licked her own juice. I tore her bra and removed her panty and licking biting her boobs. She has pink. If you want to be in control, you have to be on top. As far as what you do and how you do it, that we will both find out, with a little fun experimentation." Ooh, are you gong to be my lab teacher?" More like your lab partner. I know a little about this experiment, but only you know what feels best to you, so you have to be in charge. Are you ready to begin, partner?" Ok. Let's start, partner." Would you like to feel me deeper inside you? That seems like a good start." Oh, yes!" Then lift. And use my left hand to place my erect penis in between her feet."No more hands now SD, just thrusts and movements with your hips."She croons. I realise this will make me feel even less in control and make me look ridiculous.I nod and start to gently thrust my dick into and around her feet,"Peel back your foreskin." Denise commands.I obey and continue to thrust as Denise occasionally curls her toes to squeese my very sensitive cock head. This feels both amazing and sensitive to the point where. She blinked up at me.I straddled her and lowered myself so I sat on her abdomen. Then I shifted forward so my cock rested between her breasts. "Now Brittany I want you to hold your sister's tits tightly together so I can fuck them," I told her.Brittany lowered herself and gently placed both hands on her sister's bosom. She tentatively squeezed them together forming a softly silken channel.I moved myself back and forth. I halted my movement so the penis head had popped up from the two mounds..