For me, I always use the girls saliva for lube, because I find it hot that she's spitting on her feet and jerking me off with them
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As for how long they take, I'm torn. Sometimes I really like long footjobs (always slippery) because I just love getting them so much, but at the same time, I'd just love to cum all over those toes. It's a hard decision sometimes
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I really love soles, and I really love toes, so it doesn't really matter which part of the feet they use for it as long as it's those. No shoes though! But socks are okay for foreplay
