Wow that is so hot, GutKnife. I enjoy doing that to myself too, but stripped and oiled up at home. I rest the hilt of the bayonet, hunting knife or short sword on the edge of a heavy table or desk where it can't move. I rock back on the chair until I can put the tip of the weapon in the centre of my navel, then rock forward on the chair so the tip pushes in deep. Rocking back and forward makes my gut muscles tighten involuntarily round the blade. I can keep on 'the edge' for ages. The intense feeling drives me wild as I'm riding the blade, then if I let the chair slam to the floor, the extra thrust of the blade gives me a massive explosion.
Is this how it feels for you?
Is this how it feels for you?