I noticed my soon to be step daughter (16) is dressing more skimpy lately. Whenever her mother isn’t home she’s been walking around the house in oversized t shirts with no bra and just a pair of underwear on. She’s very flirty with me and always checks in on me and gives me overly long hugs and presses her tight body right up against me. If her mom is at work, she will bring me coffee in the morning and get right in bed next to me and lays on her side then puts her leg out over me. I once told her to scoot over for a hug and put her right on top of me straddling my dick. Then I grab her legs and grind against her several times before she usually gets up saying she has something to do and walks into her room / bathroom. Sometimes when I rub her legs my hands travel to her tight ass and she redirects my hands back to her legs. We have talked about sex before and she’s even asked me “if you were my age, would you hang out with me?” To which I basically told her of-course and how I’d probably try to date her because of how beautiful she is. She has friends and is extremely sexual but also inexperienced. She’s told me once about how she pleasured herself with the handle of her hairbrush and even told me about the porn sites she watches, although she won’t tell me the category when I asked. She reads smut constantly but apparently she likes to read about gay guys hooking up. (She’s bisexual) She clings to every friend she makes and tried to date them and they usually leave her or the friendship gets destroyed. I fantasize about her and often rub my cock with the door unlocked or slightly open wishing she would come in. I also jerk off to pictures of her several times a week. What’s the best way to find out if she has a crush on me or push it further? I’m somewhat hesitant because I don’t want her mother to find out- and she also has a few sisters that are in the home constantly as well that we hide our grinding and affection from. I thought about just planting a dick pic of mine on my phone and while showing her pics or allowing her to scroll thru, have one prior to the pics I’m showing her and have one after the pics so if I hand her my phone to scroll thru pics , when she swipes to the next pic I can see her reaction and play it off like I didn’t know it was there or that she scrolled too far.