2T4U/Confront Brittany about cheating on you
You can't believe Brittany was having that sort of a relationship with her little sister. She was cheating on you! With a girl! Her little sister! Well, actually in a way that is sort of hot, but the fact remains. You are sure you would be furious if it were with a guy, but like this... probably what bothers you the most is that you aren't part of it. At any rate, you are actually kind of glad you saw this. Even if you don't get to be part of a threesome with the two sisters, at least you might be able to use this somehow to get Brittany to finally let you go all the way with her.
First thing's first. You have got to let them know they have been caught red handed. You get the spare key from its hiding place under a rock in the garden, and then you let yourself in. You just walk over to the couch where the little 10 year old girl is getting her snatch eaten out by your girlfriend. You can feel your cock hardening already. Amazingly enough, neither one of them seems to have noticed your presence. Brittany is not just eating out her little sister, she also has her hand going pretty furiously in her own cunt. Seems they are just going to stay unaware of your presence unless you let it be known. You make an exaggerated clearing of your throat, causing Leah to look over at you briefly while Brittany still hasn't even noticed.
"Brittany." You say with a rather serious tone. You can see Brittany's body give a twitch as though she heard it, but she does not take her head up from between her little sister's legs. "Brittany." You say to her again.
"Brittany, Brittany, it's Jack." the 10 year old says as she puts her hands down on her sister's head and shakes her a little.
Brittany gives a moan of frustration and lifts up her face from between her little sister's legs. As she comes up, her hair is completely disheveled and her flushed red cheeks are glistening with the 10 year old Leah's juices. The way she is moving shows she is very aroused, but when she looks up at you you can tell she is a little bit concerned.
"What do you want?" She asks, in a tone that is somewhere between accusatory and concerned.
So, moment of truth. How should you approach this?