my sister did the same, she loves to taste my big dick and cum so much that when my cum lands on her tongue she has a power orgasm without touching herself.. i always ask her while she is doing it where she wants me to cum and she always says “u know i love the taste of ur cum, stop asking and cum in my mouth everytime”.. i love my sister to much, first time i woke up middle night and she had a mouthfull of my dick