Well, they'll both be really interested in math - more so than each other, a lot of the time - but given that they'll both be aspies, they can just sit and work problems together and that would be enough a lot of the time. Neither one would interrupt the other in the midst of a long problem - they'd both understand how annoying that is.
They could make up story problems to give to each other for their anniversarys.
As long as one or both has a job, they'd live in perfect aspie bliss.