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I thought he said he couldnt bear any children??? Please correct me if Im wrong. I must have not read right

Read petit mignon by the same author and you will understand.

He used to, yes. Imagine it like being a girl with irregular menstrual cycle or none at all, it can be hard to get pregnant. He got his heat back, and is gonna be impregnated if they have sex now.

If I'm not mistaken the doctor said he didn't know if he was going to be able to have children unless he started to go under treatment, but even in that case he couldn't be sure about. Daath started to take his medicines and heat stimulators in hopes he could bear children some day and that Juda didn't notice this fact.
We already know they are going to have two kids since they have a manga of their own.

I guess it's not really a spoiler to tell you they have twins since they have a manga on here of their own

He got his real heat back. He wouldn't be able to get pregnant if it didn't come back.

Yes, yes. And we are all happy to have the answer. (≧∀≦) cannot wait for teh bebies!