well sex is the next step but if you are board with your same tech. then trying laying a bed in your underwear (briefs) are the best in my opinion, and hump the bed such as in sex until ejaculation. Use all the mucles in your legs and your bottom to hump. this is a good tech. if you are already laying down and get the urge. just make sure you have a napkin or towel or you might ejaculate in your underwear.
Why,Don't you try having sex with a partner to spice things up