Female led relationships discussion

I’m not entirely sure how it went down, but a couple of days ago after cutting back on the teasing from my mistress while she was heading to work, I found myself home alone. Never felt more vulnerable than that moment when I started dry humping against the mattress and honestly believed I managed to cum. Yes, actual ejaculation… It really bothers me that somehow I let it happen without meaning to. I’m wondering if I need to adjust my belt tighter or what. Still haven’t mentioned it to her yet. Any ideas on how to handle this?