Katie took my hand as we walked up to the door. She surreptitiously pulled the back of my hand up tight against her cunt. I have Susan's key on my key...ring. As I unlock the door Katie sticks her other hand up my shirt back holding me close by her side.Once inside we pull into an embrace. I slide my hands up under Katie's jean jacket. She isn't wearing a bra. Her delicious girl smell is overlaid with a smokey, sweaty heady lesbian bar smell.I nuzzle her neck asking, "Aren't you with Allyson?". Mary Ann began eating my baby again and I was getting a great show of both of them locked in a “69.” As much as I love watching her kissing another woman, I LOVE watching her eat pussy. Guess it’s because she likes it almost as much as I do.Over the next little while, they got each other off several times and was killing me in the process. They moved to rest a minute stretching out beside each other but still holding each others bodies. They looked at each other and my baby asked “should we let. ” We talked about work for a while, maybe two beers worth of time and then during the third beer, I abruptly sat up straight and leaned in towards her. I lowered my voice a bit and said, “Lea, I want to ask you a fairly inappropriate question. Can I?” She screwed her face up in the cutest little smirk and said, “Yes, I think inappropriate is very appropriate right now.” I leaned closer and said, “no bullshit….does it seem like there’s something happening between us and if so, are you OK. I'd actually seduced and fucked Karen myself before I eve stopped dating her older sister. OK, call me a fucking unfaithful jerk but hey, when you get a chance to fuck your hot sexy girlfriend's younger sister, you take it. Fuck a pussy whenever you get the chance is my steady motto.Actually, my chance with Karen came one late afternoon when I'd gone over to her house and her sister, was going to meet me there. Karen's husband was working late, and when I arrived at their house, I found myself.