It sounds more than merely nice to Themis, as he gets himself standing and immediately places a hand on Byleth's lower back. For support or comfort, he knows not. Only that the touch is needed.

"I would enjoy having your head upon my chest, yes." Byleth has always enjoyed hearing his heart beat, steady and strong, while he relaxes. And the weight of his beloved has quite a bit of appeal to him right now. He guides them both to Byleth's bedroom and takes a moment to lock and seal all doors and windows.

The vigilance will allow him true rest.

After, he shrugs off his robes and footwear, leaving him only in his podea. He rests his mask upon the pile of clothing as one final act before slipping beneath the blankets. It takes a brief moment of shuffling to find a comfortable position for his wings but afterwards he is able to settle.