So, BBBJ for him. It surprised me when he shot his load because I thought I was doing something wrong because I couldn't get him hard. Turns out, he can't get hard at all. I bet it's not that uncommon, so I'm sure you're not alone in your occasional flaccid ejaculation.

Do you have a hard time with rubbers? Or, it's just kind of random?

And taught comparative anatomy labs at an Ivy university MANY years ago.  Erection and ejaculation are controlled by two different nerve pathways, the sympathetic and para-sympathetic.  You can ejaculate without any erection and obviously have an erection without ejaculation.  Two different pathways, linked in the brain, which tells you when to shoot.

Warning:  Useless content ahead
As part of being the lab instructor, I had to give a 45 minute lecture before each lab.  I did one on the exact topic above.  Had two hot girls at the front table making eyes at me, licking their lips, etc. the whole time I was giving the lecture and drawing on the board.  They were obviously trying to get me excited and hard in front of the class and make me embarrass myself.  Everyone else in the class could tell what they were doing and enjoying the contest.  I could barely look at them during the talk, but kept my dick down.  After the talk, during the dissections, I came up behind them and whispered loudly enough for most of the class to hear "And the final part of today's lab will be with the two of you in my room at 7:00 p.m." and told them where I lived in a lowered voice.  Neither one showed up, dammit.