The man is in complete control of the speed, penetration and the depth of his thrust in this position. Along with your guy behind you plus the wall surface in the front, the body motion becomes restricted.
It certainly makes you feel susceptible just like you are in custody and really wants to get rid, which is really a huge switch on.
While he keeps slipping inside and outside, try to tighten up your legs.
It will probably fit your vaginal opening inducing pleasing friction that could fundamentally land in having climax that is intense. Is not it excitingly hot?