She'd lick and tickle the frenum until your cock got so fucking red and engorged that it felt like it would explode, then she would take the swollen head in her mouth and let you shoot your hot load down her throat.
Which one would you like to try first? You should be careful that you don't cum too fast if you try my ass-hole first. Even though you say you have a slender dick, I'm very tight. A lot of men cum-off grinding their swollen cock-head into my anal opening, trying to force their cock into me, and I end up with their hot load running down my leg. It always gives me an orgasm when that happens. Is your cock sensitive so that you cum-off faast?