What do I do??

So to keep this short and sweet, my partner and I recently were able to have sex again, after 8 months of a dry spell. Is it normal to have a hard time finishing? We went at it for several sessions that lasted hours, she finished just fine and I could keep it hard but the pleasurable feeling went away after a bit, anything I can do to help with this issue?? I’ve been masturbating just fine days before we got together 🥲