Sunny is certainly smaller than a grown husband, and similarly smaller than a grown spouse of any gender. In fact, there are few people who she is not smaller than.

She rides along as Lan Wangji cleans, still resting on his shoulder. She wishes Violet and Klaus knew how great it is here, so they would want to come as well. Klaus would love to spend time in the library. She as a feeling he would set up a little bed inside it and just never leave the room. Violet would enjoy how the closets and cabinets and drawers and boxes and dressers here seem to have whatever it is you are looking for. She could invent anything she wanted, because she would always have the correct tools and supplies needed. The best part though would be that none of them would need to worry about Count Olaf or his associates ever again, because Crowley said so, and Crowley is much more trustworthy than Mr Poe or anyone else back home. The only person who has shown up here with any sort of tattoo on their ankles was that nice man who wanted to look at butterflies. Sunny cannot imagine Count Olaf ever caring about a butterfly, unless that butterfly was the heir to an enormous fortune, and Count Olaf was caring about kidnapping it in an attempt to steal said enormous fortune.