A girl I know routinely sits on my lap whenever she sees me sitting somewhere. She would do so abruptly and initially sit close to my knees with her back facing me. But covertly she would slowly and incrementally maneuver herself up my lap over the course of several minutes, until she would be sitting directly on top my groin. So she would begin by sitting on my knees, but eventually she would be sitting directly on top of my penis. Then she would remain sitting in that position for the remainder of the session and do various things like playing on her phone.

I can't help but accidentally get an erection every time she does this, and my erection would get harder the more she wriggled around or moved her way up on my lap. And when she finally maneuvers herself up to my penis and sits on it, i can feel my erection make contact with her buttocks and her upper thighs.

She would usually be wearing a skimpy dress or miniskirt whenever she does this to me, but I never notice her dress such a way in other scenarios; she is usually dressed conservatively. I also notice that she never does this to other guys, she only ever does it to me.

I'm not sure what her intentions are, but when she wriggles around my erection it makes my erection even harder. But I don't know if she notices it because she doesn't seem to say anything about it.

Also, because she is sitting directly in front of me, sometimes my hands end up resting on her thighs. And because she is always wearing a skimpy dress or miniskirt whenever she sits on me, her thighs would be exposed and my hands would be directly holding onto her bare thighs. She would leave my hands there and not move them away, but if I moved my hands away very often she would grab it and put it back onto her thighs.

Also, she often sarcastically says "Hi NAME_1" with a grin on her face when she sits on top of my erection. What does this mean and why does she say it?