Girlfriend daughter

So my gfs daughter is 11 and I’ve been in her life for 4-5 years now... and she is BEAUTIFUL AND THE MOST SEXIEST GIRL I HAVE EVER SEEN!!!!!! Often in the beginning I never thought nothing as she got older and I helped her bath and things, things started getting interesting I could help but be attracted to her.. I would wait for her to fall asleep and her mother leave for work and I would sneak in and hope she would be dead asleep and I would look at her.... sometimes she wouldn’t be wearing underwear and I would touch and caress her little soft ** .!!! Omg amazing lick her ** whatever I could without her waking up... well anyhow as yrs went in now she is 5 ft tall and beautiful omg I get hard just looking at her little fat ** but now her mom don’t work and I can’t get her to sleep soon as I touch her she wakes up ..... I have to have her I can’t take it just to ** her ** again and taste her ** and even if I can just get half my ** in her I have to..... tired of wrapping her underwear around my ** and master batting in them but I don’t kno how to get her to sleep threw it without her waking up but still being safe without drugs or something dangerous... idk what to do I just want her to sleep while I take her all of her tasting every inch, I try to think her mom is her when we ** and luckily her moms ** look the same and is right but it’s not her..... can anybody help me and don’t judge me please