Quickies...

I just want quickies some times but my boyfriend goes some long, that I get turned off, he goes soft and he never cums. It's getting so frustrating, it leave me wanting more and feeling like I'm not pleasing him. What can I slip in his food/drink to keep his stamina going where he cums in the finale? I really don't think I'll be getting pregnant any time soon. How can I help him out?