Step daughters/Do-good-Mom/playful
Watching a mother breastfeeds her baby would give most people warm fuzzy thoughts about pure maternal love and devotion. Not for you though who instantly noticed Anna's body reacting to her toddler sucking on her tit.
You come next next to her with a big grin on your face and Anna reacts by a warm innocent smile.
You go seat next and put your hand on the back of Emma's head. You:"What a lucky little girl she is, having some quality time with her mother like that!".
Anna: "You hear the mister? A lucky girl you are indeed!" and her smile becomes even bigger when she looks at you.
You keep petting the back of Emma's head until Anna switches tit.
You report your attention to the breast now free and start to wipe softly the saliva with your fingers, accidentally rubbing the tit a few times.
Anna:"Oh no that's ..." She gasps and giggles a bit from the extra stimulation and her daughter having a renewed vigor after switching side.
You've wiped out all the saliva and, without pretending anymore, cup her breast with one hand while you put the other on the back of her neck to kiss her passionately. She reciprocates but her hands goes toward yours on her tit and you can clearly sense her confusion. After the kiss she starts to push back your hand very gently.
Anna: "I am not sure ..."