I'll just hold you, I won't touch randomly

I'll just touch a bit, I won't rub randomly
I'll just rub a bit, I won't go in
Once I go in, I'll just move a little, very quickly
Everything is just a setup except for the "very quickly" part, which is true.
This is the foot-in-the-door effect, also called the threshold-stepping effect.
It refers to how individuals are more likely to accept subsequent larger requests after accepting a minor one.