After the glow of my incredible orgasm and watching my sister and Robin kissing and sharing my come I thought how lucky I was that I am in a position to have both of these girls! I knew that most guys never got to experience a threesome and here I was watching two gorgeous girls kissing and I felt the sexual tension in the air and I decided that I was not going to waste any more time with watching, I was going to join in.
I sat up and reached out to fondle both girls. As I took Robin's nipple between my thumb and forefinger, I also pinched my sisters hard nipple, which elicit a moan from both. I grew bolder and leaned in and wrapped my moist lips around Robin's hard nipple only to find my sister had her mouth full of Robin's other tit. This shocked me, to discover that my sister had gay tendencies but then I realized that they were comfortable around each other sexually. This turned me on so much that I had a hard time keeping from blowing a load right then and there.
I piped up with, "Robin, lick her pussy." And without a moment of hesitation Robin was down between Sis' legs.
I could hear the sound of Robin's tongue licking around the juicy cunt and I decided then I was not going to be left out any longer.
"OOO, yeah lick me," I heard my sister moan and this had to inspire Robin because she reached down and grabbed my sister's les and pushed them up against Sis's firm tits and really started going to town. The squishy sounds coming from below Robin's inspired me to reach over and run my hand down Robin's back and then between her smooth thighs.
She was up on all fours really giving Sis a tong lashing and as I reached the moist petals of her pussy, I heard a deep moan and the reverberations coming from her throat must have been magnified ten fold because Sis screamed loudly, "God, you are licking me soooo good."