I can understand why this couple have not consummated their marriage.
Tsukasa is 16 years old, while Nasa is 18.
Tsukasa has already mentioned that Nasa's kiss attempts leaned on the “bullying” side.
They are technically married, but Tsukasa is a maiden at heart—and a 16-year-old that wants to approach the consummation of their marriage with caution.
Essentially:
[ul][li]The emotional/physical relationship is like boyfriend & girlfriend.
[li]The legal relationship is that of husband and wife.[/ul]Sure: some gals would admit to wanting to consummate the marriage without hesitation.
Tsukasa wanted Nasa to enter that marriage relationship (legal) so that he would be "off the market".
This would also put Tsukasa in the same place, and the marriage helps deflect the wackos.
True: living in the same room with her husband leads Nasa to some passionate moments. But Tsukasa's intention isn't to be a tease.
The deal was: "Marry me" (done and done) "and I'll DATE you." And that's pretty much what they're accomplishing, though it feels very much cart-in-front-of-the-horse.
I side with Tsukasa. She's head-over-heels in love, as is Nasa. Waiting for the right moment will not be, as far as things have unrolled so far, that big of an issue... hopefully.