My Step Sister Doesn't Kick Me Out When I Walk in on Her Being in the Shower

i get very horny when i hear the shower being turned o because it means my step sister is going for a shower , Just the thought of her sexy perfect slim titty body is all soaped up , her hair wet and me standing beside her with a rock hard dick , Hoping she will not kick me out , Instead she reaches for my throbbing dick and touches me . Excitement i cant contain i grab my step sister turn her around , spit on my hard massive thick dick and shove it right inside her , playing her her perfect tits as i pound away at her tight little good girl pussy