>position myself and use dildo by hand
>feels good but I have to carefully and actively tweak the angle and position of the dildo between and within every stroke

>hold the toy still with my hand against a surface and push myself doggystyle against it
>fucking brain melting pleasure and constantly on the edge of a HFO, only have to tweak angles and positions when I'm getting too used to the feelings

I don't fucking get it, why? how? I even make sure that my position and the hand motions in the first case recreate the same dildo-to-butt interaction as if it was the second case, from a relative point of view.
Too bad this dildo's suction cup doesn't work at all. If I had more privacy I'd buy a bigger toy with an actual suction cup, and I'd be moaning like a bitch and cumming buckets from slamming my ass to the wall.