WB means "Welcome back."
There has been a very definite theme since Ellery's first rash and unnecessary injuries and overdoing it in the first month of their relationship to show that Ellery has complete disregard for his own health when it comes to sex. Only severe and unrelenting pain slows him down: partly due to his libido, partly due to his intense desire to please Ennis and give him what he so obviously craves and has been missing, and partly driven by an underlying fear that he will be kicked to the curb for not putting out, because it has happened. Saying no in the bedroom is not something Ellery knows how to do, and is consistent with his sexual submissiveness. Willingness is what he is used to, and as he gets older and less able, and more stressed out, his willingness is being contradicted by his own physical limitations.
I find Ellery such a fascinating character, he's a contradiction in his personal and professional life. I find the whole thing about him being sexually submissive very interesting and I understand why he is. You have just helped me understand that little bit more Louise, and I could discuss this element of his character all day. I just wish he could stop thinking that Ennis is going to leave him, just because he cant have regular sex. I want Ennis to tell Ellery all the things he's been thinking about lately, so Ellery knows
exactly how Ennis feels about him. That, at least, should help reassure him.