I wouldn't try the ass grab right way, I would try some of other things first and see what her reaction is to that. If get out of the shower or leave the door open an you can play it off as an accident if she is freaked out. But if she is straigh up eye fucking your cock when she takes a look, then I would say try the ass grab. If she's checking out your package that pry means she wants some of it. It dose kinda seem like she has some thoughts about it but wouldn't go overboard cuz she might just be very open with herself around you cuz you are her son. Make sure you can tell the difference before u try anything crazy that makes things awkward. Let me know what you do and how she responds.
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Have you ever made a move on your mother or another relative? If so how did you do it? I don't want her to catch me wanking because I think that will ruin things! I'm definitely going to get out of the shower as soon as she walks in? Usually I turn my back when she walks in, would you advise facing her so she can see my cock? Should I have a boner when she walks in? :)

First off did you read what I wrote the object of the game is to have her see your cock why would turn away. An no dont have a boner just get out with you shit lookin good meaning NO COLD WWTER hint shrinkage. Put your towel as far away from in the bathromm as you can. When she walks in get out walk right pass her to get your towel making sure she seen your cock. If possible get really close to her with your cock without touching her. If she is horny an wants your meat stick she will grab it or maybe unintentionally brush up against it. If anything like this happens or is looked at it like she want to suck it your prygood to try other small things like gettin caught jerking off or grabin her ass. I used to do all of this stuff to my cousin she used todo some of the things your mom did like change with the door cracked. She would walk around the house with a sleeveless t-shirt on with no bra an a thong when she stayd at my house an my mom was at work.
Ok I understand the shower thing now will definitely try that.. The other day she bent down right in front of me wearing sweatpants and my cock was right at the level of her ass.. Was that an opportunity to do something?? I'm your opinion does she sound like she's horny? Sometimes my dad travels for weeks on end which means I'm the man of the house.. I mean at the end of the day she's a woman and she has needs right? I was also considering watching a movie with a sex scene in it with her what do you reckon?