Step daughters/Do-good-Mom/playful/suck her tit/Orgasm
You decide it is time to push it even one step further and you move one hand on her crotch. Anna grins and looks away a few seconds.
You make a motion as if you wanted to pull down her pant. Anna looks at you again, this time with wide eyes. She starts to make no with her head, weakly, but you keep teasing her with your tongue, and your hand, and Emma is still sucking on her tit and ... It is just to much for Anna who gets up just enough for you to pull her pants down.
Without wasting any time you have your hand inside her panty rubbing her clit, your fingers then going in her completely soaked slit faster and faster, your hands still rubbing her clit and your tongue playing on her breast, drinking her.
While Emma is finishing her last drops, Anna cannot hold any longer and have a vibrant orgasm against her daughter and you.
Afterward she remains panting for a while while you go put Emma in her crib right next to Anna. Anna looks at you excited but also a bit uneasy and confused.