Rationally that might make sense, but he doesn't tend to look at himself and his reactions in a rational light. He just doesn't think to let her spoil him. It doesn't always occur that she might enjoy taking care of him, that it's not just an unfair drain, if he lets her. (Of course, he likes doing things for her just fine, but he doesn't think it all through.)

If she's going to invite him, though, he's not going to shy away. Even if he's a little uncertain where things are going. (There will, probably, never be a time when he's not uncertain.) On the other hand the position he's in isn't really conducive to looking sexy as he half-wriggles up onto the bed properly, stretching his legs out and falling heavily beside her. Comfortable, real beds, that's a luxury he is still savoring on a daily basis.

But he's not gonna be bashful, he's well within arms' reach, looking over at her, guileless and trusting.