He can't finish?

Sami

So me and my bf normally have sex every day. The past few days( about 4 now) I have just so not been in the mood for that ( also got a cut down there so it hurts) so I've been just trying to finish him. I have no problem with it and love doing it. He gets to where it's like he's about to then nothing and he tells me either "it's gonna take awhile" or "it's just not happening I'm sorry" he said he's very sore down there from all the build up and that he just needs to cum. We keep trying with no luck. Any tips on how to get him there?