I really want one of these: an oversized blanket with sleeves. The person who thought that up is a genius. Of course, the next thing they need is to make one with two sets of sleeves so you and your SO can sit together under the blanket and both have sleeves. Hoods would be a bonus too.
Maybe this says something about the temperature in my house...
On second thought, if you could get your SO underneath the blanket in the first place, the last place I'd want their hands is in the sleeves.