I actually have the opposite problem where it takes more than average to get me off and I need a good 30 mins or so to reload.  But you hear about pre-mature ejaculation all the time.  Not anything new that Im aware of.  So did you get any further with the couple or was it just the BBB?  You know we wanna know!  

Pre-cum is clear and watery. If his was thick and milky, then he probably just shot a little of his load but managed to hold back his full orgasm. It takes some practice and self-discipline, but basically you get yourself right up to the point of no return and then FREEZE - no movement, no touch, no stimuli. Give it a moment for your stirrings to subside and then get back to action. Sometimes you go a bit far and you might shoot one or two shots, but not the whole load or full orgasmic cycle, which allows you to continue at full staff rather than deflating and waiting.

I noticed pre-cum when I was younger, but at around age 50 it seemed to disappear.

It is the most common way couples who practice the old coitius interruptus (Pull out just before ejaculation) get preggo.

I think if he came so much that you noticed it, it was not pre-cum but the real ejaculant.  It is not impossible to hold back after the first squirt and then save the rest for latter.  It takes a lot of will power and good kegels, but I know I managed that one time when I started to come to soon and held back for several minutes more.

Those were the good old days.

My precum is clear and can be substantial if edging, but there's NO way it'd be confused with a cumshot.  However, every body is different and that's not to say his nuts can't pack a wallop, it'd just be rare.  Sounds like you enjoyed them, and they you, so no reason not to repeat and perhaps even talk about it with them.  Never know unless you ask, and he might learn ya' something!  Which of course we all want to know too...