A Month-Long Lock's First Real Release and the Strange Orgasm Experience

My wife let me out for some fun yesterday after I’d been locked up for 25 days. Once she finished her full-body massage and oral pleasure, she unlocked my device and told me to fill her up… hooray!! However, here is the odd part: just a few minutes into our intercourse (it wasn’t going to be any porn-star level performance), I shot my load - no buildup, no pressure, nothing. It felt like a ruined orgasm but with the pleasure of fucking still present??? This has never happened before, though I’ve also never been locked for more than 12 days at a time so … Is this typical?? I was anticipating a massive wave of relief and release, but it turned out to be merely an emptying - no manly satisfaction whatsoever.