Maybe Sulu didn't need to do anything, but. Well, he wasn't used to being able to do anything for Valentine's day, and so the novelty was too good to pass up. Besides...

"I wanted to," he said, shrugging and moving to pour himself one more glass of wine, "I mean. ...You're here. So I wanted to make it worthwhile." Because it really wasn't so long ago that he would've only dreamed about being able to do something romantic and, yeah, sappy like this with Ianto. And now that Ianto was alive and in good health, it would have seemed ridiculous to pass it up.