convinced that she wants to engage me sexually. I also suspect it might be just in my mind. I
don't have the sophistication to do anything about it but it fills my thoughts.
Take it one step at a time. All of us have such thoughts.The moot question is if she really wants you sexually or just admires your looks,having seen you since you were a baby.
There is nothing wrong if both of you want it.
Start slow. Compliment her about her appearance. Move on to "friendly" nonsexual touching . And pay attention to her reaction. If she's smiling and flirty get those hands closer to her private zones. Let them linger some. And pay attention to her reaction. If all is still good, try a few light touches to her ass or boobs that can be written off as incidental contact. And pay attention to her reaction. If all is good, try a touch of two in private that can't be written off so easily. If you get a smile instead of a lecture, he bolder still and pay attention to her reaction.
If you're not shot down by this point, have protection at hand and a plan to deal with the consequences if your mom finds out.
When you visit her don't wear any underpants get your self hard first and leave your pants unzipped, see if she keeps looking at tour dick
You will know if she is interested in being naughty you will sense it just read hre body language