I warm up my member, warm up my cylinder by filling it up with hot water and when im ready for the session i pump with the heating pad wrapped around it.
On the side note…..i have a few ideas….making my own cylinder out of glass bottle (no bpa and easier to warm it up) and somehow wrapping a custom net around the tube that heats up the cylinder so i wont have to mess with that heating pad or other stuff that keep the tube warm